Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed97066c9eb1e67…

MALICIOUS

PDF

68.6 KB Created: 2021-04-08 07:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 907256744092d3d2bfd7d08aebd60478 SHA-1: 308aaa9dc173da350302d4ee216999a114ec8468 SHA-256: 8ed97066c9eb1e67ef782762afcc046232302f4285bfcbe2612d7f20032bfd03
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though partially corrupted, suggests a lure related to 'invertebrates review worksheet answers', directing users to external sites. The presence of multiple distinct hosts and disposable hosting indicates a link farm designed to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://golowaki.ru/123?utm_term=invertebrates+review+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/kobamebexog/giYgcie/dibipivixogemuviniwufe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_606916a0ec4ae.pdfIn PDF document text
    • https://gulesome.weebly.com/uploads/1/3/4/4/134496781/5eb6e1ff62c.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/6bc04f31249093f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_5fe6fe7f00a7c.pdfIn PDF document text
    • http://vadanunagirira.getenjoyment.net/lodonizijotovedum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486353/normal_5fd95b2d2245e.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/EhiMhfX/bunny_pancake_kitty_milkshake_game_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465003/normal_5fcb521800484.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463792/normal_5ff203f200792.pdfIn PDF document text
    • https://cdn.sqhk.co/dowamagova/iaMcLzl/dragon_spirit_arcade_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xalixonawi.atwebpages.com/22355935206.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/pifusonut.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/break_even_analysis_book.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/how_to_use_flex_tip_digital_thermometer.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/dilemudozurabi.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/fepesezorigaxez.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/rue21_hiring_age_requirement.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15D 5036 bytes
SHA-256: 5ec2780e0dc93f46cb8a7a69ee3e5199631ebac95a4770bdfd908dc5e1c9dfb1
font_01_sfnt_off0000e28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28B 9712 bytes
SHA-256: 045ee689f6eda454170b17e855684df19410aba994484ed250941a06e3e1d650

Open this report in the interactive analyzer, or submit your own file for analysis.