Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd821717d9025a6…

MALICIOUS

PDF

81.7 KB Created: 2021-06-08 03:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 87fbb67901c808e54072087ca9f4a32d SHA-1: 54b1dfa6098acf5649c69831561e69ee0d63f690 SHA-256: dbd821717d9025a645d9a4601a2b176782e2a35863e62697209e5ffe1fcd0969
186 Risk Score

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 0.9992

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://wastran.ru/pbw?utm_term=books+like+my+secret+garden PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384048/normal_5ff54dbd592a3.pdfIn PDF document text
    • https://rezibufebaxiban.weebly.com/uploads/1/3/2/6/132695258/4455251.pdfIn PDF document text
    • https://nafoxowozuvika.weebly.com/uploads/1/3/1/3/131383754/9349376.pdfIn PDF document text
    • https://vaferomesab.weebly.com/uploads/1/3/4/3/134351928/genifejatasawesox.pdfIn PDF document text
    • https://milafesubori.weebly.com/uploads/1/3/4/7/134745217/d7af1a56e1.pdfIn PDF document text
    • https://zajawegunane.weebly.com/uploads/1/3/4/3/134332092/e1684117c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418362/normal_60609b66cdc22.pdfIn PDF document text
    • https://sufixekanol.weebly.com/uploads/1/3/4/7/134712322/wulogabo.pdfIn PDF document text
    • https://gagebopa.weebly.com/uploads/1/3/6/0/136051288/melavale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469852/normal_6031459dd9fc3.pdfIn PDF document text
    • https://dazuzidasepod.weebly.com/uploads/1/3/2/6/132681566/7307737.pdfIn PDF document text
    • https://puzileto.weebly.com/uploads/1/3/4/6/134674509/60fac1c0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490272/normal_5feb07a671331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500208/normal_60bb862e3fd7f.pdfIn PDF document text
    • https://mejebogisoxofix.weebly.com/uploads/1/3/4/6/134606558/muralagasotug.pdfIn PDF document text
    • https://vajigapevinukaz.weebly.com/uploads/1/3/4/5/134578345/c37ba193a90dbf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sejawes.pbworks.com/f/organelos_dela_celula_vegetal_y_su_funcion.pdfIn PDF document text
    • http://kemulosomul.pbworks.com/w/file/fetch/144728808/nada_de_carmen_laforet_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06154fff-1599-4e24-8e09-45a281d3a031/firex_smoke_detector_disposal.pdfIn PDF document text
    • http://sonopewobu.pbworks.com/f/responsibilities_of_hr_recruiter_in_consultancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb3eb2d-1dd6-481b-b286-4f8027caca71/por_que_fracasan_los_pases_libro_completo.pdfIn PDF document text
    • http://lururefisu.pbworks.com/w/file/fetch/144560604/avast_secureline_vpn_key_iphone.pdfIn PDF document text
    • http://bepisoxu.pbworks.com/w/file/fetch/144772851/senerolazixeposepo.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_off0000ffb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB5 5476 bytes
SHA-256: 42ae9237d56d578cf5debd5e92c9fdadbb760c64cdd2d1860855ed134aef076b
font_01_sfnt_off0001124c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124C 11380 bytes
SHA-256: 2ab3e0c9980e19a1bc0cf15ed6e3ca307797e5763edf671cf245dde88056c4d2