Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3950f06ce26bbae…

MALICIOUS

PDF

90.4 KB Created: 2021-01-29 07:51:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 44703d88bdb1495214529eb963e73207 SHA-1: ce4d429c89e21a2abe1a149ffc44623c5955db11 SHA-256: c3950f06ce26bbae6b1a17ae88b56cbeaa287c094349dbb0ea32cf0d3f90cc84
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute traffic or host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/123?utm_term=principles+of+development+lewis+wolpert+free+pdf PDF link annotation
    • https://cdn.sqhk.co/kewukapugino/Jhcichj/17892335853.pdfIn PDF document text
    • http://tegekagag.22web.org/84163242268.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/lgctVQn/vomifepukused.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/jTidR3X/this_is_the_police_2_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/hjiaQb9/best_movie_quote_quiz_questions.pdfIn PDF document text
    • https://tujezagen.weebly.com/uploads/1/3/4/7/134775207/674466.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/eYdzePI/thorough_definition_synonyms.pdfIn PDF document text
    • https://cdn.sqhk.co/fufejapopunu/AgcFhjd/63465275687.pdfIn PDF document text
    • https://cdn.sqhk.co/wukibezoso/gzjfhhQ/dominos_delivery_discount_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500199/normal_5fd25f9e22619.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/icjfqgi/31189297419.pdfIn PDF document text
    • https://cdn.sqhk.co/dogovonediwa/hjdheSm/xasumixo.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/i6Kjcly/brasfoot_2020_crackeado.pdfIn PDF document text
    • https://cdn.sqhk.co/gowexenopa/fghF2jb/die_abenteuer_des_jungen_marco_polo_folge_26.pdfIn PDF document text
    • https://fidifeso.weebly.com/uploads/1/3/1/4/131408027/dcc7a81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389571/normal_5ff55916cea23.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/hsOugdD/jw_library_setup_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://merapuw.epizy.com/aarp_life_insurance_contact_information.pdfIn PDF document text
    • http://laletanegimiw.epizy.com/android_broadcast_receiver_uses-_permission.pdfIn PDF document text
    • http://bebezira.epizy.com/46605469116.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_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 2960 bytes
SHA-256: ba9dd86ad06677ef82b9fc66565cbe1db364e5caa8fb73f24ce3e10b7ab9a08b
font_01_sfnt_off00012481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12481 5244 bytes
SHA-256: 9442d47a552c028d2e02f89c1334371e11f578c502bf45816e1146ca7d1a8fdb
font_02_sfnt_off0001365c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365C 10740 bytes
SHA-256: 95010fbab66f6e086b023693487a8990e561bbb0c69c7b4d3377b92743e24350

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