Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb31f92671ef2a6…

MALICIOUS

PDF

75.1 KB Created: 2021-03-06 19:10:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6ef8e9724b7de9d5adad8a8f85a0dcdc SHA-1: a3f838e321f6afde21d3fc8d39c463c2fec5025f SHA-256: cfb31f92671ef2a6b1449b915e1aa15d8f496417a0e9f1f778ebd6c14a9c3a84
186 Risk Score

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 0.9998

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://midufefew.ru/wix?keyword=passengers+2016+movie+parents+guide PDF link annotation
    • http://collegegraduatecentraldating.com/i_wish_you_mored5w1s.pdfIn PDF document text
    • https://cdn.sqhk.co/duvetezoje/hc8zicy/nf_paralyzed_lyrics_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/hdhjiej/allegiant_flights_to_florida.pdfIn PDF document text
    • http://shop-profildoors.ru/manofateporozosesetatsm6e.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/70452410634ojli0.pdfIn PDF document text
    • http://pokemonrivals.online/bgv_report_full_formivf36.pdfIn PDF document text
    • https://cdn.sqhk.co/nusatabi/xFCJhaZ/boferuweje.pdfIn PDF document text
    • https://cdn.sqhk.co/zalopubid/djjIrZq/street_racing_tokyo_mod_apk.pdfIn PDF document text
    • http://gogadozuxigode.iblogger.org/vijezu.pdfIn PDF document text
    • http://summer-italy.fun/jexikomomopejavuxojoknvgf.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/samsung_j5_prime_price_in_kenya_2020.pdfIn PDF document text
    • http://yatvoyya.fun/799051702166zgt3.pdfIn PDF document text
    • http://idealslim-ordina.site/beclometasone_dipropionate_formoterol_fumarate_and_glycopyrronium2e4t4.pdfIn PDF document text
    • https://cdn.sqhk.co/viwedanej/jOjijea/thrift_store_brooklyn_park_md.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_1a486fbf3c3d437481895e75fa3ba756.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_85a16be1a8b147eeaa42bb4f893abd71.pdf?index=trueIn PDF document text
    • http://zedorufusoli.rf.gd/excel_template_gantt_project_planner.pdfIn PDF document text
    • http://wuguwusilabibax.epizy.com/40682565705.pdfIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_5e941edc90644fffafa41e1872e7608e.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 5788 bytes
SHA-256: c39632c7ae3ebee383914df529d7c58d3c9f38a16dca819ae4e7d06b80ea8c08
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 10504 bytes
SHA-256: cbe49e607b8de68ed1b72b6d1a093ddad931c878701baa5aa6db39f22373ddba

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