Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f21807f89d9a58c…

MALICIOUS

PDF

70.0 KB Created: 2021-03-11 08:34:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 45cf4b9a6e042f04d39458eefd9024c7 SHA-1: dc4bae0b4f10899e75fb81f7e331e969cf9b4caf SHA-256: 2f21807f89d9a58c30ae1e155c0fae57af80423ea464c2bc8f2a8dd2cb3e5ecf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/strik?utm_term=how+to+connect+printer+to+hitron+router PDF link annotation
    • http://smm-target.ru/data_science_bachelor_degree_salarya8ie6.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/ajgNYii/gofexonenofekisi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425227/normal_601921f404189.pdfIn PDF document text
    • https://sobepaded.weebly.com/uploads/1/3/4/3/134305425/275387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_60170b620a8e5.pdfIn PDF document text
    • https://cdn.sqhk.co/tizuvuwo/Chcrico/best_horror_vr_games_steam.pdfIn PDF document text
    • https://sukowuxipimo.weebly.com/uploads/1/3/4/3/134318810/koxuwajidatewaji.pdfIn PDF document text
    • http://tb-films.ru/wuzulura20gi8.pdfIn PDF document text
    • https://deziledage.weebly.com/uploads/1/3/4/3/134339849/18eea9eaa7b.pdfIn PDF document text
    • https://dizufarul.weebly.com/uploads/1/3/1/3/131379939/tivobobudejanopiji.pdfIn PDF document text
    • https://fusufuxono.weebly.com/uploads/1/3/1/6/131606103/1551336.pdfIn PDF document text
    • https://cdn.sqhk.co/sibuborepato/ve7hdKB/glossaire_franais_anglais_comptabilit.pdfIn PDF document text
    • http://esportzmlevent.com/what_is_the_importance_of_recovering_and_recycling_the_wastevjxz8.pdfIn PDF document text
    • https://vafiradas.weebly.com/uploads/1/3/3/9/133988778/lozifopabum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484814/normal_5feb086364e29.pdfIn PDF document text
    • https://kemumapuvepuvi.weebly.com/uploads/1/3/4/3/134311950/2202691.pdfIn PDF document text
    • http://br1.red/river_flows_in_you_lyrics_koreane654y.pdfIn PDF document text
    • https://lijokojojet.weebly.com/uploads/1/3/5/3/135333606/123a19cb85f70d8.pdfIn PDF document text
    • http://reliables.ru/1734-aent_series_b_eds_fileikcn8.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/4ac7d.pdfIn PDF document text
    • https://vakilelem.weebly.com/uploads/1/3/1/3/131379598/surunisopedupakepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468274/normal_60293c7b39392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_600c525cd17c6.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_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 4652 bytes
SHA-256: 6f382ad06a6bc926c061258b7ca633ee46b3424282d57b32606d7ec42cfe2c34
font_01_sfnt_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 10068 bytes
SHA-256: 4605de51d55799689739379b808556938b6c66e1c0a89326aa90eec3179dc7c0

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