Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c10db62fd0e3c1…

MALICIOUS

PDF

74.6 KB Created: 2021-05-28 16:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 8d12cd87e7863bf1e05c47c491f255fd SHA-1: ce29b5aeb98acc007513f57927514772c9642ce1 SHA-256: 73c10db62fd0e3c138e62e472026a729b7f2c3bcaf0bfc470160d2fb24738b24
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious sites. The primary malicious URL identified is https://pelibifir.ru/123?utm_term=boom+beach+warships+tech+tree+guide, which is presented as a guide for a game but acts as a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/123?utm_term=boom+beach+warships+tech+tree+guide PDF link annotation
    • https://vevusivo.weebly.com/uploads/1/3/0/8/130874001/rigifulog_gavoga_xekuwevinuv_godozuwi.pdfIn PDF document text
    • https://wesonibisizigoj.weebly.com/uploads/1/3/0/9/130969529/jufawezujozelemur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463287/normal_5fca3c5796eb4.pdfIn PDF document text
    • https://lobalose.weebly.com/uploads/1/3/6/0/136089755/tikikujumu.pdfIn PDF document text
    • https://direwuberegenis.weebly.com/uploads/1/3/4/3/134361890/6012671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421615/normal_605ba5b7e08c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408989/normal_6004bbf018638.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc1a69f-3f02-4353-a6c9-40db2fbf33da/11570565665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed04c9e9-f60d-42c1-a141-1d71742c905c/80022037030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f0562a-6175-44dc-8eaa-82850a5a2764/lunoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdba4981-8a0a-4b03-854b-e2c49925e1c3/how_to_crochet_a_baby_boy_hat_0-3_months.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c908f9cf-9a8a-44d7-8c16-ca0fd89b826a/bibomolubamejusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4178b912-32bc-4c58-9478-27d4bceeceb2/elastic_and_inelastic_collisions_lab_report_conclusion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b68f3c14-c4bf-4111-a6d1-e09e3b7723b9/james_patterson_books_2020_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dfcda80-b6ee-4754-a4c8-194a1574f962/gixodigaretutizunuminirik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cddbab6-8a3d-444c-9c51-8d02d3e5ae7b/blue_moon_tavern_pbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6ad0f84-6295-4817-8984-73f70e5e7368/22412590693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d633c55-1d4b-4325-ba73-4965032d4a20/povezozovukotat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/993bd876-7f72-407e-83bc-ae9d1a12a620/19388791191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b8a70ea-88bc-40fa-b062-d747e425dd36/80925197787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fe99cc4-e729-434c-9579-e660d9cf14a5/how_to_set_my_taylor_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53006133-0859-42a0-81a3-bf959808583a/41291846770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2125e51c-382d-4b7f-95b2-bf313615b2cb/32168948707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/256746fe-9dbd-4b79-a050-1c2a825eb29c/ejercicios_preposiciones_de_lugar_espaol_para_extranjeros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e124fa9e-824b-466f-aa91-fa3ca057a266/ver_pelicula_online_cuenta_conmigo_espaol_latino.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 5736 bytes
SHA-256: d3fac17f4456aa39693fde03c42588d2305b4f7022d2cfe19b1f879424c48047
font_01_sfnt_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 10596 bytes
SHA-256: aa3908cb5c3f41e890315a8c2c597e6d9241a084b8ba70e0f2c976bc0dd4e8c3