Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3ec3963269c7f8…

MALICIOUS

PDF

66.1 KB Created: 2021-02-20 01:44:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b66c2c953588c7ee49ec54cdcf9ece03 SHA-1: e44a8afcbea957ca5f91372f958082fc06278489 SHA-256: fb3ec3963269c7f84b4787a01590b2259ed1adeacd2b4111b23ac1a6f04733af
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The embedded URLs suggest a phishing or malicious content distribution scheme.

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://jottigo.ru/123?utm_term=night+shift+song+country PDF link annotation
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/8245306.pdfIn PDF document text
    • http://sun-italy.space/coffee_day_global_limited_annual_report_20175dl8c.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/1598064.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/gjcGBmj/jogilukuxikibumam.pdfIn PDF document text
    • http://fusojosejivo.iblogger.org/16442116945.pdfIn PDF document text
    • https://zegilaritapedu.weebly.com/uploads/1/3/1/4/131438092/5785b2851.pdfIn PDF document text
    • https://gawofatofuwe.weebly.com/uploads/1/3/1/3/131380275/nurimo.pdfIn PDF document text
    • http://yachts-4-sale.com/2005_yz_125_manual4bnp8.pdfIn PDF document text
    • http://tumbaa.space/davis_drug_guide_online_discount_codelal50.pdfIn PDF document text
    • http://jinokonur.22web.org/construction_project_management_jobs_houston.pdfIn PDF document text
    • https://tizemafuniture.weebly.com/uploads/1/3/4/6/134636649/dc6eeeed23ca89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366031/normal_6008c7009799d.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/BIjcOJa/black_rifle_coffee_merch.pdfIn PDF document text
    • http://brosbass.com/vezev3r0dn.pdfIn PDF document text
    • http://teenagetutor.online/smashbox_mascara_ingredientsbsqmy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473640/normal_5fec9fe38a6e7.pdfIn PDF document text
    • https://zalinojawovuga.weebly.com/uploads/1/3/4/8/134886974/tuxopulidi.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_off0000bafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFA 4736 bytes
SHA-256: 7b0e3de55db1a92f919462a12da797096e3bbe6e5e1987d04b8b8fb16dc3f5e1
font_01_sfnt_off0000cb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1B 10008 bytes
SHA-256: de5377e487ccc1ce4c7e38ed8fac2d7859e6d3bc330584059b6a8400ae059aeb
font_02_sfnt_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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