Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8737a4ce48af84…

MALICIOUS

PDF

71.8 KB Created: 2021-03-15 20:38:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5cac4e803d8d1e31d6052c81f64b1b81 SHA-1: 1456b1326fd46bc2cdcd32f1e94114d9034dd4a7 SHA-256: bb8737a4ce48af84f71222a4e70e05210e08160443bb98a0a1b21be76b280c6c
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.001 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including brand impersonation for credential phishing and a link farm on disposable hosting. The ML classifier assigned a high probability of maliciousness. The embedded URLs and the document's structure suggest it is designed to trick users into clicking links that lead to phishing sites or potentially download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://laxefepi.weebly.com/uploads/1/3/4/5/134528647/tidasijarerer_tometonenafel.pdf.
  • 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://xezojetit.ru/wix?keyword=2019+jetta+repair+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401519/normal_5fe4760e24bdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_60230f456cf49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380530/normal_601869d5caff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450418/normal_5fe7cf869e733.pdfIn PDF document text
    • http://tusuvopub.22web.org/frases_celebres_del_amor_en_tiempos_de_clera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_602c7a1340d4d.pdfIn PDF document text
    • https://laxefepi.weebly.com/uploads/1/3/4/5/134528647/tidasijarerer_tometonenafel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411931/normal_5fdc51831562a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485702/normal_5fcd08a36944b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391909/normal_6032a96e62f81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447450/normal_600fd492cfc66.pdfIn PDF document text
    • https://davokirik.weebly.com/uploads/1/3/0/7/130739121/fusotezugozaw.pdfIn PDF document text
    • https://tumunonapuve.weebly.com/uploads/1/3/1/3/131379134/lodapoxudi.pdfIn PDF document text
    • http://balonedud.iblogger.org/authorisation_form_cra.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/ccfbd8a1-9180-4fcb-95a0-a502b8c5646b/jaxowuxaf.pdfIn PDF document text
    • http://sapofikij.epizy.com/gmat_official_guide_2019.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_486a06d259d448f6a121b490c04587c6.pdf?index=trueIn PDF document text
    • https://c4647614-9ff8-4b00-b819-08dc938bd166.filesusr.com/ugd/5d3f24_4acadbcc85e74b7b8f03edb1fd5d9da6.pdf?index=trueIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_21e938351c9d4c66aff328a23fd1b39d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12eeaa15-d32e-432a-a981-8f65816bb77f/tivufosawiwon.pdfIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_0f30c27aee2b43a084d42da4213e8dac.pdf?index=trueIn PDF document text
    • http://vonizupereru.rf.gd/pakolisugom.pdfIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_03acaf95e1794d2e97a8223d95016ace.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_off0000dbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE2 5248 bytes
SHA-256: 20f93c4b9c2e45740e1d1e97ef4cc193d26dc76ced3f23776e4d674155094df5
font_01_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 10560 bytes
SHA-256: 9b8aea2be833fda27ff86697daef18d82c45cb141c02615c93f6f6f25377e1be