Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d0092bc33e8331…

MALICIOUS

PDF

76.9 KB Created: 2021-06-01 21:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 829cebd9a3252baa0557635a94b95531 SHA-1: 8439cd4aa0e68791d989b792ee4240bb8b3558da SHA-256: f4d0092bc33e833150544d403410e6fdfa506e39163b8cfdadd5352488cdad5f
194 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs and the heuristic findings suggest a phishing or malware distribution scheme, likely using the document as a lure for users searching for software serial numbers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/pbw?utm_term=corel+videostudio+ultimate+x5+serial+number PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495413/normal_5fceefef3d6ad.pdfIn PDF document text
    • https://piminuwimizo.weebly.com/uploads/1/3/4/6/134674326/7edda639.pdfIn PDF document text
    • https://mikuzowadakan.weebly.com/uploads/1/3/1/3/131383480/danuravuxi-naloxotamefo-ginebaj-pafexumesopona.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_60139d6d169fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471945/normal_5ff50e14ebf3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446388/normal_5fedb9e6af786.pdfIn PDF document text
    • https://jokimaxe.weebly.com/uploads/1/3/7/5/137513409/2025473.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379848/normal_60051fe0a40cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144423333/22043208785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bad87395-883a-4db2-b5e4-f4e0a8fe755c/juvat.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144412035/headway_pre-intermediate._workbook_with_key_5th_edition.pdf.pdfIn PDF document text
    • http://fixiguru.pbworks.com/f/subway_surf_hile_apk_indir_son_srm_cretsiz.pdfIn PDF document text
    • http://kinuwibe.pbworks.com/f/18900661797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d466e162-ef9d-4f23-b9d9-93a8161500bb/beretta_92_trigger_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/699d8970-50c5-4bca-94c6-f8361b78310f/65666192712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b4f5620-e88c-4ec3-8b05-82d9cf15e5d7/34675406583.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/f/unclaimed_property_state_remittance_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc3c559-9fbf-4b9b-8225-b82f73ee64ed/55236883881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b566edc8-0a50-4ad3-8ec6-a64b99f33eac/16738766880.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/rna_transcription_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dcbe2da-14f1-485d-b087-7463032532ce/the_lost_ways_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df8e2bb-b8fb-4e59-846e-0fa738372d85/gusuvetute.pdfIn PDF document text
    • http://ganosidil.pbworks.com/w/file/fetch/144453756/what_are_the_heart_emojis.pdfIn PDF document text
    • http://jijagenaneke.pbworks.com/f/fubaloxol.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_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 5268 bytes
SHA-256: 077af913b999298df9de8d17a6beda962996d4f7b814d25c5676c52f7c289abf
font_01_sfnt_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 11740 bytes
SHA-256: c61e1e582afa8dccefaf4c2e79e0b91429c2a7a11f514fb3347a23b5f637a662