Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf55770aeaf83bf0…

MALICIOUS

PDF

86.4 KB Created: 2021-04-07 20:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3982468d2e8f98ed8c16f718fa8b8fd0 SHA-1: d71aee5ce6e41acc162c8f9b80d4874d9da3db5f SHA-256: bf55770aeaf83bf047f9d4234ebd2eb1a1a491c305b24139e58abeaa0f91060c
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 0.9998

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://midufefew.ru/wix?keyword=koji+ice+cream+maker+instructions PDF link annotation
    • https://cdn.sqhk.co/fafaviwi/hhjiagc/youtube_luke_combs_new_song_six_feet_apart.pdfIn PDF document text
    • http://acgmgroup.ru/54727518890xq8sp.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/answer_key_eureka_math_grade_5_module_43eqne.pdfIn PDF document text
    • http://salonlabs.xyz/44689121696s56i4.pdfIn PDF document text
    • https://cdn.sqhk.co/piwizogir/AaeHdgg/80348034084.pdfIn PDF document text
    • http://dresdenpharma.ru/divekulizejazitz657n.pdfIn PDF document text
    • http://lestyprin.online/temizuq96eu.pdfIn PDF document text
    • https://jumolemema.weebly.com/uploads/1/3/4/8/134853288/lerit-kurakudiravamen.pdfIn PDF document text
    • https://xalemewo.weebly.com/uploads/1/3/4/6/134665704/wezewum.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/gjYgieG/felabuxi.pdfIn PDF document text
    • http://begdas.space/bemuvuzepadapiwuzotobgtkn.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/cPgighj/8708713915.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/7c5b3808-7ad7-453f-89cb-6b71a68524b0/sofugimafemenevoposik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9152e487-e174-4c67-a516-652770c39dd1/can_i_use_my_wahl_clippers_on_my_dog.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/89972059725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a599bc04-ab3f-412c-a11b-66b136231fec/rumumilis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2370e3a1-a93d-42bb-a637-a5748f703cda/gomazigirijuvuwadotiv.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/ul_online_certifications_directory_quick_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/febf5e14-bd4b-42ac-afd4-d5417f3402d9/10402068993.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_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 5020 bytes
SHA-256: 54c0426fd53a65745d753714036899ae83e3b59d7f3cc6fec575bf66772cbc56
font_01_sfnt_off00012616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 11168 bytes
SHA-256: 92b78badd7c77dab2187a4ec080c18b49fdcd8ed71858531474bc9b0423a94be

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