Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8364097589716c5…

MALICIOUS

PDF

79.9 KB Created: 2021-05-01 22:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9a355f6dc0f1e39f78456c29a761fc97 SHA-1: b78869c7febc2e3d4c5bbc9bc7fd01fec55d59a3 SHA-256: d8364097589716c5934d92e814f17fb44d4453bbca504168cb0cca4f66e0de49
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to manipulate search results or direct users to malicious sites. The document body contains metadata related to its creation, but no direct user-facing lure text was extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=2000+chevy+silverado+1500+starter+wiring+diagram PDF link annotation
    • http://tulusujubige.mygamesonline.org/how_to_get_rid_of_poison_ivy_rash_fast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460230/normal_602e0c4bdf6d0.pdfIn PDF document text
    • https://cdn.sqhk.co/linewebozid/kLGgdij/75907967802.pdfIn PDF document text
    • https://mojabizozawobe.weebly.com/uploads/1/3/4/6/134699592/lupabifojexu_setoxe_fixaware_wovize.pdfIn PDF document text
    • https://foxesusonixuna.weebly.com/uploads/1/3/5/2/135298742/7123753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487903/normal_6029cbac2128a.pdfIn PDF document text
    • https://widunamaki.weebly.com/uploads/1/3/4/8/134886597/zukewexiraju_lesoruzi.pdfIn PDF document text
    • https://megewesaj.weebly.com/uploads/1/3/0/7/130738707/fezazir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_605ff98251abd.pdfIn PDF document text
    • http://boost-shop.xyz/what_are_the_rules_for_high_school_softballtghkr.pdfIn PDF document text
    • https://cdn.sqhk.co/mugodetutag/mibDggy/lomevigowudixolubiva.pdfIn PDF document text
    • https://sakixuso.weebly.com/uploads/1/3/4/4/134488330/kizakujigeli.pdfIn PDF document text
    • http://pubggaming.online/swot_analysis_lecture_notes02emr.pdfIn PDF document text
    • http://mofonuf.medianewsonline.com/kutaxap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_6014ca2e347bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480891/normal_5fde736d58592.pdfIn PDF document text
    • https://kawotubizon.weebly.com/uploads/1/3/1/8/131871780/91de448f5.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/different_types_of_tort_claims.pdfIn PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/nuresijera_dutakedinebodo_sisapem.pdfIn PDF document text
    • https://ralunudedosamot.weebly.com/uploads/1/3/4/8/134856058/rogumuvulu_fogorokakezusev_wizoxosal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 5748 bytes
SHA-256: f5e4d18ac2d33405739cae06df81b2d072ed126e1f64555b2a5e93e1e4e93990
font_01_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 10936 bytes
SHA-256: 62d434041796df0567a9bc73540ad003c49529fb65b71be1e84ddd1fccb789e6
font_02_sfnt_off000123d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2