Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b280bef2cde3fc1…

MALICIOUS

PDF

79.0 KB Created: 2021-04-24 11:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c4c5190168a813715e05131a55fe16d SHA-1: 62fceec58e0b108566891938b2d900d2d20a7fff SHA-256: 2b280bef2cde3fc1b7b67f2d79348275cc8ad1a821366b1d8ca01f9764e68848
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to other PDFs, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/strik?utm_term=el+dador+de+recuerdos+libro+completo+pdf
    • https://cdn.sqhk.co/pimibopugugo/HheJgfk/stick_hero_fight_hack_mod.pdf
    • https://cdn.sqhk.co/vopofuxo/ptkgibk/wyze_outdoor_camera_sd_card_setup.pdf
    • https://cdn.sqhk.co/busibelifiv/dThaFsm/wupogede.pdf
    • https://cdn.sqhk.co/lidojuxuxiro/ymEzWgc/17601967821.pdf
    • https://cdn-cms.f-static.net/uploads/4466367/normal_600e2321f3e38.pdf
    • https://cdn-cms.f-static.net/uploads/4426257/normal_6030f764533ee.pdf
    • http://rojenugilin.22web.org/bit_mesra_b_tech_application_form.pdf
    • https://cdn.sqhk.co/pemejurove/fXkieU1/pifawagopabuxe.pdf
    • https://cdn.sqhk.co/bogulevim/iahhtoH/13723232181.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mabagojovas.epizy.com/xedapuxotarolupobijigami.pdf
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_eec1c1c9ab054fefb152509913196258.pdf?index=true
    • http://gizogebinide.rf.gd/supesakojiludijobef.pdf
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_f95e4e8d432a47a885dea33eb37ce0b3.pdf?index=true
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_4ec5721a6309421dbe7baa9d2040e8bc.pdf?index=true
    • http://buwefitilo.rf.gd/developing_skills_for_the_toefl_ibt_free_download.pdf
    • https://7fd4abad-31f8-4c52-ae8e-93d0cc7f2af2.filesusr.com/ugd/910e70_f912418d4e744356bbf4f591dfc4aca2.pdf?index=true
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_6f61acce04ef420997a204d9fa1bbfba.pdf?index=true
    • http://wowimes.epizy.com/daily_routine_worksheet_for_grade_3.pdf
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_ea65800f72934043bbe5c7197f20b63b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f438.bin
2fc97d83e6008c27133bb72b7a6b0d335c156ea7c32ce6080e6e6e69a9ca160a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 5400 bytes
font_01_sfnt_off00010678.bin
0be6ff9a281119ba825b01ca1237bacc29d7ad136c0c852516a1a531bcc46608		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 11836 bytes

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