Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df39414d27955b9…

MALICIOUS

PDF

77.4 KB Created: 2021-03-23 09:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 41b0db62b5f1987e0f292e34a5bf6888 SHA-1: b00d11aeb10d5e267f5f44ae3510a167884b17c2 SHA-256: 6df39414d27955b91b4b0c7ae90efafe981911570f71b486404aef1ecc7efd73
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL, https://mezovuduw.ru/strik?utm_term=lord+of+the+flies+summary+chapter+10-12, suggests a phishing or scam attempt by luring users to a site with a deceptive query. ClamAV detection and ML classification further confirm its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=lord+of+the+flies+summary+chapter+10-12 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454421/normal_5ffddf431c5d1.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/QIAgfRg/expeditions_tuscaloosa_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/BhdLTVB/download_factory_inc_mod_apk_2019.pdfIn PDF document text
    • http://ottics.ru/argentina_football_jersey_20204t5v8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422161/normal_600c378b4e055.pdfIn PDF document text
    • https://cdn.sqhk.co/filovixedalu/HAxgeiB/kogejusaga.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/jjgaahf/79941133019.pdfIn PDF document text
    • http://islemleriniz.org/slader_algebra_1_common_core_pearsonyost9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_5fd914b1da2ae.pdfIn PDF document text
    • http://jusapp.club/2012_end_of_the_world_full_movie_download_mp4_in_english7nvbj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383304/normal_604e16a08e074.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492593/normal_601a2e585f46a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443576/normal_60579a0a7b113.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/vqidQgf/91981560952.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388815/normal_5ffded71ce0b2.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/gehjMib/57365873729.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411500/normal_5fcbc8f07b6ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_5fda7dc387562.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_57dd4720b59e46de892c14715fbccdc2.pdf?index=trueIn PDF document text
    • https://e6343aec-df69-40e7-9959-3c0c55bf73c9.filesusr.com/ugd/6a9017_6ac010f7726a49deaadef6165d71dc7b.pdf?index=trueIn PDF document text
    • https://9f4ad419-87ad-4507-9b23-40b7c7395cc9.filesusr.com/ugd/55478e_526cf9e987d5445bbfde2b78c28d82e0.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_6618fa928e2940d9b499aae628594205.pdf?index=trueIn 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_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 5796 bytes
SHA-256: c456011abda11f7fd870248d220b10b17912d01b33cd04d757ea1b4caf8cfccd
font_01_sfnt_off0001018d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 10852 bytes
SHA-256: 62271896532d61db988a7e615d3d3beb930b89038e88458170928bc4b3c1cf8d