Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefde91380abc36e…

MALICIOUS

PDF

74.5 KB Created: 2021-04-04 07:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f84dc8ca21cb568ac978a622bcbedf1e SHA-1: 8995d8a190ab2b21f73abd6997c41546048956e8 SHA-256: aefde91380abc36ee02f97aee047d82d93bc94eef3a452d33a2a39acd3eabbf5
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure and a password-protected-archive lure. 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 0.9997

Heuristics 8

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/wix?keyword=code+psn+gratuit+sans+telechargement PDF link annotation
    • https://majejuwusi.weebly.com/uploads/1/3/2/3/132303270/tofenuriw.pdfIn PDF document text
    • http://3-bureaureport.info/finite_element_analysis_projectnrxhz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481056/normal_605c2146ab81f.pdfIn PDF document text
    • https://jolidezebixisu.weebly.com/uploads/1/3/3/9/133997790/6541177.pdfIn PDF document text
    • https://bakogala.weebly.com/uploads/1/3/1/3/131384254/gubador-zaruzitiwupegel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458412/normal_60256022c1c93.pdfIn PDF document text
    • https://ratemalopez.weebly.com/uploads/1/3/4/7/134753477/ranekadil-vobamanonaz.pdfIn PDF document text
    • https://gonamaputopo.weebly.com/uploads/1/3/4/5/134511465/gotiropaped_fenerevip.pdfIn PDF document text
    • https://cdn.sqhk.co/towojutal/ejhdHij/tibakamatexidarep.pdfIn PDF document text
    • http://salestore.pro/tegepuwab9gm9.pdfIn PDF document text
    • http://rubeatyshop.xyz/31435413316onf8b.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/heroes_gods_and_monsters_of_greek_mythswa1qj.pdfIn PDF document text
    • https://cdn.sqhk.co/xisiwuba/jiijjij/avril_lavigne_skater_boy_lyrics_meaning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_f5d645decff844018576ad8d5dd66eb8.pdf?index=trueIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_e6cc78549f434770b02ba4d89c688b6a.pdf?index=trueIn PDF document text
    • https://6b21c484-99f8-4e97-b77a-b77c054bfe5d.filesusr.com/ugd/f139d4_b9660639ad114348bfdbffdaac5cb66c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/65905189017.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_7e8e59f4a0484d4dbf93178fa389d629.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/54928078254.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_dc9c4cebb3214b58ae4d3c21654bec03.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_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 5392 bytes
SHA-256: c40278153873e3ee7dc42e1dc0a2016989bc15e1c87026d81d72fa05fea09e71
font_01_sfnt_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 11860 bytes
SHA-256: 7c9e10f3b062a87210547aa25fe8130508861cadcb47fc109c7d56218e5b787c