Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e2ce764172bd60…

MALICIOUS

PDF

69.4 KB Created: 2021-03-16 01:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fca401808b71854366f3a42766d27fae SHA-1: cf1d4d967a96ddf6eb8055dd641669415c621797 SHA-256: 51e2ce764172bd603f154f751b20e0fa8569a87b229b9127f07a79ff70b57ede
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/wix?keyword=shaw+guide+online PDF link annotation
    • https://keduwamiboru.weebly.com/uploads/1/3/4/6/134669925/nuzapozej.pdfIn PDF document text
    • https://sodolujakuxef.weebly.com/uploads/1/3/1/3/131398606/3295927.pdfIn PDF document text
    • https://cdn.sqhk.co/bibolaned/jhhihjj/11188129931.pdfIn PDF document text
    • http://bofesota.66ghz.com/communication_strategy_plan_template.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/djegfME/toca_boca_life_world_hospital_secrets.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/evujjyg/repimutiromizutavave.pdfIn PDF document text
    • http://vogudikomi.getenjoyment.net/lorubaxifubev.pdfIn PDF document text
    • http://retamos.mygamesonline.org/gargle_with_apple_cider_vinegar_for_white_teeth.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/hiNdji9/macross_factory_satellite.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/hhfMM14/carpentry_course_cost.pdfIn PDF document text
    • https://wigowuwadapol.weebly.com/uploads/1/3/5/3/135315864/lofetaxomazifizotopo.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/jcObibl/nick_robinson_ex_girlfriend.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_5fe657ecc0d40.pdfIn PDF document text
    • https://cdn.sqhk.co/zowesifona/igjjfey/stickman_warriors_gift_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/825ijeY/kugexinewofos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386609/normal_5febf881a1652.pdfIn PDF document text
    • http://tulutita.sportsontheweb.net/61394200423.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fasewevabudumu.epizy.com/xevigenulunutafos.pdfIn PDF document text
    • http://xuwugufufokiti.epizy.com/59480118511.pdfIn PDF document text
    • http://fumesowira.epizy.com/suzixagizujo.pdfIn PDF document text
    • http://sipenewodadavuv.rf.gd/the_revenant_full_movie_hulu.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_off0000d3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DC 5008 bytes
SHA-256: 11ef4cf59d785394c3954167cc4eea3c04cd2a7d69db51e09df20a003597fe89
font_01_sfnt_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 10384 bytes
SHA-256: 5eb7011f201ee85fda21758fb47fa75447e638172def314711006fb7d4c5b29b

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