Malicious PDF — malware analysis report

Static analysis result for SHA-256 5037920e4cf99989…

MALICIOUS

PDF

77.7 KB Created: 2021-04-06 19:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4ec58bc206fbe778193d328d7c9ba417 SHA-1: 4a955b31644f954208d2040371dda08f7489c973 SHA-256: 5037920e4cf99989333405fc33b326b48cb2eaf46e490f2fbd411a29fb98c72c
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/strik?utm_term=do+books+have+an+age+rating PDF link annotation
    • http://cashthe.ru/24514569694193lv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_601000de7ace0.pdfIn PDF document text
    • http://tuwukadinem.mygamesonline.org/anaesthesia_classification.pdfIn PDF document text
    • http://chategratis.online/sipelaverazidojixapt2m3k.pdfIn PDF document text
    • https://murufirekitopu.weebly.com/uploads/1/3/1/8/131856476/2421437.pdfIn PDF document text
    • http://instasurprise.online/yeezy_700_azareth_on_feetcvavs.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/hitron_cgnm-2250_manual.pdfIn PDF document text
    • http://samelike.site/backbeat_fit_does_not_chargep2a1f.pdfIn PDF document text
    • http://sendgrid-de.com/wd_my_passport_wireless_ssd_500gb5cfuv.pdfIn PDF document text
    • http://4gusevshop.space/amesbury_archer_ks2_worksheetl5pm8.pdfIn PDF document text
    • http://mumopajikex.mygamesonline.org/nofegagaxizolejetoguwirub.pdfIn PDF document text
    • http://ketaton.mywebcommunity.org/35457764089.pdfIn PDF document text
    • https://guvoladedesu.weebly.com/uploads/1/3/1/4/131453897/30559.pdfIn PDF document text
    • http://nekretnine.site/78364448902piiuo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_603bf428baaa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423427/normal_602a2aa4c40cd.pdfIn PDF document text
    • https://telanadiv.weebly.com/uploads/1/3/4/4/134495792/rekazarurik.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/powupofa.pdfIn PDF document text
    • https://sepiximefajo.weebly.com/uploads/1/3/4/8/134849953/2681cf9f2bf.pdfIn PDF document text
    • http://twitter-center.com/dejame_que_te_cuente_jorge_bucayx8v2k.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/1c028abb-14bd-4b2d-a0fe-d75ad46b8dac/sutakudaxidan.pdfIn PDF document text
    • http://soxarigur.myartsonline.com/dujuviravajinaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a51047b2-2287-4ec2-98fc-b841c8ca30b0/24796498593.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_off0000f2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 5180 bytes
SHA-256: fd83ad413e416d6ba9bf8b1d62d008de450268d042aee929baaf42a401763ff1
font_01_sfnt_off00010447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 11052 bytes
SHA-256: 13c0f1d72aca448ac915156df875818fac615be5bfd4655438fd93d56f4d42e4

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