Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2aef2b78136b69…

MALICIOUS

PDF

79.2 KB Created: 2021-03-20 18:34:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a6a13d90891e5528efdc53e2c6bb97fb SHA-1: 26af3fec768c86097e118c6592722be2f9871c22 SHA-256: af2aef2b78136b6963b6508d8dff90767292250d43e7d88633d72020540b3ec7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous external URIs that point to various websites, likely for SEO manipulation or to host malicious content. The presence of many external links on disposable hosting further supports its role as a distribution mechanism for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/award?keyword=cancer+de+mama+sintomas+pdf PDF link annotation
    • http://nogurufegu.mygamesonline.org/20899495130.pdfIn PDF document text
    • http://mexawolin.medianewsonline.com/rilafafip.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/Figjjp3/36439016808.pdfIn PDF document text
    • https://cdn.sqhk.co/wamiratena/jfbidje/17184098862.pdfIn PDF document text
    • http://kudopifupelixi.22web.org/74350413703.pdfIn PDF document text
    • http://tamogulaganero.scienceontheweb.net/simple_present_tense_exercises_perfect_english_grammar.pdfIn PDF document text
    • http://dodemawaj.iblogger.org/suwov.pdfIn PDF document text
    • https://cdn.sqhk.co/waxolulum/zU0WJhf/chromecast_built-_in_apk_mirror.pdfIn PDF document text
    • https://cdn.sqhk.co/xugikokazo/apljgaO/western_wallpaper_hd_iphone_8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2345bc0d-28b2-46a9-ad02-e2c021afcb59/70846483590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e49003-2486-4038-9772-c4c84fd2056a/what_kind_of_batteries_does_a_coleman_lantern_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa93047-0fd2-499e-b536-4874ad391ab9/why_pay_to_subscribe_twitch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20cba9bb-d33a-4ee2-9ebb-a5fdbfeaf6d7/how_to_write_a_table_of_contents_in_apa.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_1dc3b103ad2d49faab6ad4acd1f3d2bc.pdf?index=trueIn PDF document text
    • http://sidukumu.epizy.com/chain_of_custody_form.pdfIn PDF document text
    • http://bidusibebawuz.onlinewebshop.net/adobe_photoshop_cs6_tutorial_in_telugu.pdfIn PDF document text
    • http://jidariramosofaf.rf.gd/2020_calendar_uk.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_cf3a82551bbe4ba1a027d5a1bc827761.pdf?index=trueIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_b096a3ea412747d1abdd69ec0404d0c4.pdf?index=trueIn PDF document text
    • http://fiderifi.rf.gd/jesus_calling_devotional_bible.pdfIn PDF document text
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_2dd6b737b43d48b8aa3dd998d0b7283b.pdf?index=trueIn PDF document text
    • http://wajiletum.epizy.com/delopemowekedowaxanu.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_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 5172 bytes
SHA-256: c50a7ecfff0545542de4433daf9846e9dca5b780470af4c676f1385abd0345e5
font_01_sfnt_off00010830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10830 11760 bytes
SHA-256: 53bb62290d07b522995e879a566e39bcaba9f4be03e0f044746bdc4a5640f0ad