Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffaf69082e16742…

MALICIOUS

PDF

79.2 KB Created: 2021-04-03 04:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 04ec8932f9ea9ffb52ff503c11e23884 SHA-1: 6a432d141217f617bd1e19ee88b2aa83dcd0de81 SHA-256: dffaf69082e16742fd14bbdb23fd29d0c85661d7a7b7e4632f1df42ad8ed375a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with a phishing attack aiming to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=marlin+model+60w+stock PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462730/normal_5ff280d6443d2.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://easy-money-cash.space/how_do_you_fix_a_kenmore_refrigerator_ice_dispenserdejip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447647/normal_6022db8938366.pdfIn PDF document text
    • http://sale20.site/golijoswjw3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414847/normal_603e1788a7d8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446398/normal_5ff29f31a05b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388052/normal_602a0f4a55cb5.pdfIn PDF document text
    • http://drilltech.info/87847226553la6jv.pdfIn PDF document text
    • http://martans.space/boxhead_zombies_2_hacked_unblockedf5blv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414678/normal_6007d0dbc5ac7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479707/normal_6009c6fcdcda7.pdfIn PDF document text
    • http://lg-copyrightforms.com/27469090889uirt5.pdfIn PDF document text
    • http://eeeeeyyy.space/challenger_correct_score_betting_tips_apkgxn6o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456372/normal_6057bdb50c164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414332/normal_600f9e0a39579.pdfIn PDF document text
    • http://kupivse.xyz/jowulodufogekul1oupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496170/normal_605ffb29124a4.pdfIn PDF document text
    • http://domainlimax.xyz/molarity_practice_problems_worksheet_answersmqbjc.pdfIn PDF document text
    • http://life50it.pro/49649967129n1wzf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388842/normal_601301619c659.pdfIn PDF document text
    • http://relax35.ru/62713837343mniau.pdfIn PDF document text
    • http://shopsupergood.site/one_margarita_wiki_luke_bryan_lyricsu1x8v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 5540 bytes
SHA-256: f9cd36018c66757ad28d06f2c6fda5404184992d315be847059fdb3b5fe91bdd
font_01_sfnt_off00010b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 10524 bytes
SHA-256: 9ca4b4d2e2f3f87a1bc8e40a31bbe05b28178f54118b9c65883579fb9bf9a75e

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