Malicious PDF — malware analysis report

Static analysis result for SHA-256 513c44d8de0ccdad…

MALICIOUS

PDF

74.6 KB Created: 2021-03-30 09:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 79edf3eaf3116777e4c8dfa3db642796 SHA-1: f6db8ef4983600b5744a6b64a260a47c0fac8eca SHA-256: 513c44d8de0ccdad0ff2d3e8befd5030b2ed495912c27cd8eaa08f9b7c73de20
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The presence of many external links suggests an attempt to redirect users to malicious websites, likely for phishing or SEO spam.

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://seumenha.ru/123?utm_term=simple+present+negative+form+structure PDF link annotation
    • https://cdn.sqhk.co/gejupajo/ifYChgh/tazokasizixusure.pdfIn PDF document text
    • https://cdn.sqhk.co/zokasejiz/dhblxjg/heroes_2_the_undead_king_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/hijiWgc/jajufupazumikozokot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_60238ef52cb65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413473/normal_602f7144a0b30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489402/normal_6035797a8fc48.pdfIn PDF document text
    • https://rapodiduwegez.weebly.com/uploads/1/3/5/3/135311990/binipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485943/normal_60213eff8382c.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/ChJqhfz/maxeruzigijuk.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/gawexeginemunerumaxawa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384832/normal_6004e05e1f9e5.pdfIn PDF document text
    • https://dopizuledukure.weebly.com/uploads/1/3/2/3/132302960/2332223.pdfIn PDF document text
    • https://witowufagefalob.weebly.com/uploads/1/3/0/7/130738848/jagopimorafupas_gadokonodot.pdfIn PDF document text
    • https://cdn.sqhk.co/temazajilib/lgj4d9i/juxukorowusejezuneror.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/dhbEhhd/rock_and_roll_music_beatles_guitar_tab.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/introduction_to_asymmetric_information.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491969/normal_602708ad49100.pdfIn PDF document text
    • https://sofubile.weebly.com/uploads/1/3/4/3/134380394/3face.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/ciejfhe/60180064860.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_off0000e4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F1 5500 bytes
SHA-256: 2e210adc1bc315e08a466b278261f5d372afd37e5bc2acf1e42530217e3d057b
font_01_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 11048 bytes
SHA-256: 461b0b6265383846fff16046a5186263fd76828d4222e6a28dadb82623a7c808

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