Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdac2ca835be63d…

MALICIOUS

PDF

87.2 KB Created: 2020-12-25 04:40:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 51780cd649520704d145af90e82542f5 SHA-1: d60cc033705846fd636dded4f4a593ef15ca3bf6 SHA-256: bbdac2ca835be63dc08bf13c3ecc801c5bb8e58244ce5a7a8cee4e4e3830e1bf
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content, likely for SEO manipulation or to host malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/strik?utm_term=red+velvet+cake+recipe+225+ml+buttermilk PDF link annotation
    • https://daxuferawul.weebly.com/uploads/1/3/4/5/134592581/xunakomu.pdfIn PDF document text
    • https://cdn.sqhk.co/wiluxuko/3icS1jj/funny_videos_for_tik_tok.pdfIn PDF document text
    • https://butegipabozu.weebly.com/uploads/1/3/4/2/134235803/5397036.pdfIn PDF document text
    • https://fesinukovib.weebly.com/uploads/1/3/4/7/134715349/nopubegoka_bugujuzob_bugovumevivujiw.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/900127.pdfIn PDF document text
    • https://gabodudir.weebly.com/uploads/1/3/4/7/134717456/8332403.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/sexez-bibaf-vamifeboji.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/rZNijie/tovinawijevasi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3079d656-468f-4da8-939f-a6e2b70e5e45/nba_2k17_apk_obb.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/sivusoratedepovona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20f5d8c-bd20-45b9-8378-a6edc621b64f/lelalixofawerewujisuradog.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/zamuriwiruzozezabadiw.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 5232 bytes
SHA-256: f0e8773becaaedb8fe1d46e71248f017c58de20d247b14241da6b88095d2f4e4
font_01_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 10888 bytes
SHA-256: a57beda9a07090811be473a4fa32faa53217689d8341555f5400917985691049
font_03_sfnt_off00012944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12944 16340 bytes
SHA-256: ee8b8f013b6f51ea08ae5b70d5412f202f6a9076b23c75f4a41c6f6118619bdf
font_04_sfnt_off00013ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBF 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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