Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb992188859f312…

MALICIOUS

PDF

80.7 KB Created: 2021-06-09 04:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ff9f804393ab14a79233c2535c777582 SHA-1: 3dcf7f502c60fc27e54c3d5429d6ed38b0b3a462 SHA-256: 7cb992188859f312eb6c7fdc86b92281b3f8d799be7ff1252f15a6727d7d8fbf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on `https://synerhu.ru/pbw?utm_term=chang+physical+chemistry+pdf`. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://synerhu.ru/pbw?utm_term=chang+physical+chemistry+pdf PDF link annotation
    • https://pajodutakimileg.weebly.com/uploads/1/3/4/4/134474341/f1755c56df92d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416935/normal_6008d645a63fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408460/normal_5fd8fddb679ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501998/normal_601e066952cf7.pdfIn PDF document text
    • https://bilukejax.weebly.com/uploads/1/3/5/3/135392742/a9ac3d55.pdfIn PDF document text
    • https://biwusegunaji.weebly.com/uploads/1/3/4/0/134096831/fizuwanipajanawe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481852/normal_5ffe00fd87562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417024/normal_60b87a1802751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470380/normal_6058dae15138c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459468/normal_6035422d479a6.pdfIn PDF document text
    • https://moleresudiba.weebly.com/uploads/1/3/4/4/134447347/e56efd.pdfIn PDF document text
    • https://tekuxarutupun.weebly.com/uploads/1/3/0/7/130775258/7817390.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
    • http://fokurid.pbworks.com/f/fuxakijafutujokuxifu.pdfIn PDF document text
    • http://moxulolo.pbworks.com/f/worlds_together_worlds_apart_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0856b8-6eb2-41be-aab1-d8120c623fe2/lavolesugokolor.pdfIn PDF document text
    • http://wipadewor.pbworks.com/f/adiemus_karl_jenkins_sheet_music_free.pdfIn PDF document text
    • http://liguduper.pbworks.com/f/kosobizogutizexutukiwi.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/w/file/fetch/144727062/cool_hd_images_for_whatsapp_dp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab051f4e-cba5-446b-a4b9-eb50452efa07/26893297013.pdfIn PDF document text
    • http://moletose.pbworks.com/w/file/fetch/144902751/33741312056.pdfIn PDF document text
    • http://zosajivapesi.pbworks.com/w/file/fetch/144542442/denom.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 5372 bytes
SHA-256: 9147b4beaa5b21316d1758e7df0ebf2963c855f52a4bd7a86491abb1204e2645
font_01_sfnt_off00010395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 10488 bytes
SHA-256: 555b88863e92f9d77c25ba170f6be1122917ace0fd6053f9767ab5664aae36f6
font_02_sfnt_off0001276e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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