Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3755e7feaa1f3b0…

MALICIOUS

PDF

101.7 KB Created: 2020-11-22 05:19:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 790535498e84f958d8b14fab7382e3df SHA-1: 908a0e9c9e3c25f1d0fb5cc10ef743cc5e95cb26 SHA-256: e3755e7feaa1f3b078659d2249dd47faf28e50ef8728295ab3270c2ad270ef63
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=gema+asma+2019+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4457311/normal_5fa760f18d177.pdfIn PDF document text
    • https://nigiseza.weebly.com/uploads/1/3/4/4/134462574/popixur.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/xineroxixogase.pdfIn PDF document text
    • https://pelofaneb.weebly.com/uploads/1/3/4/2/134235527/21db79d3783f.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/pixusobejaluxewe.pdfIn PDF document text
    • https://nowusunomotir.weebly.com/uploads/1/3/4/3/134314498/04d6865bac5aa70.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/1907280.pdfIn PDF document text
    • https://defagetomorig.weebly.com/uploads/1/3/4/5/134576552/8951596.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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
    • https://uploads.strikinglycdn.com/files/dfaa8462-a249-4f16-afb4-16c91e580db3/xofapedelomen.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/7th_grade_grammar_assessment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f37c1cd3-1ddc-4dea-9234-251eb01d0d50/18382726754.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/rewidod.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/carquest_oil_filter_85515_what_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead0fb2d-4e4f-4d0c-a4a9-d078ced77562/letter_sample_to_remove_member_of_a_board.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/70226162305.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/naruto_bleach_game.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13833 2320 bytes
SHA-256: 4860ab75d9d8960a607af8bc57f4783a5769b5451228c488f4749b7b178b352e
font_01_sfnt_off00014279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14279 5016 bytes
SHA-256: 2c75dbaea33155832e7da290a8e3122defcfce066e16a750d88f97aae30abe56
font_02_sfnt_off00015389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15389 12080 bytes
SHA-256: c206699b3565be6555e56aadc790944457215488bf2f640885ba0740d59db68f
font_03_sfnt_off00017b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B26 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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