Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ce788ef70858ae…

MALICIOUS

PDF

94.4 KB Created: 2021-04-06 15:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6011413e0ddde5a54d87955edd6ddc58 SHA-1: 71683d85a522d0c4b1441c770b797574c13c8833 SHA-256: c4ce788ef70858ae08a3a07e507cb14fc27116e5da6c0bc8b5a3d847f7d998a2
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 0.9993

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://jumiwimov.ru/strik?utm_term=usarec+form+3.2+download PDF link annotation
    • https://zigajimimokok.weebly.com/uploads/1/3/1/3/131383588/zizogutemaxituvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528260/normal_6062bde7cbf26.pdfIn PDF document text
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/rakuwa.pdfIn PDF document text
    • http://satumatajug.iblogger.org/49104573802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377678/normal_5fd9b724e91c1.pdfIn PDF document text
    • https://wulakajif.weebly.com/uploads/1/3/2/7/132740593/959252.pdfIn PDF document text
    • https://telexetobowu.weebly.com/uploads/1/3/4/3/134339901/7a67de52.pdfIn PDF document text
    • https://xirejefeju.weebly.com/uploads/1/3/4/7/134723985/wuzodoposobuliwapur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_6043b03a23a5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_60595f84bae03.pdfIn PDF document text
    • http://tapidiv.medianewsonline.com/alan_moore_biografia.pdfIn PDF document text
    • http://zovitidagawas.sportsontheweb.net/37085734799.pdfIn PDF document text
    • https://vujajewuriwox.weebly.com/uploads/1/3/5/3/135387523/buxuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472494/normal_6008cf7053fa2.pdfIn PDF document text
    • http://rewetuxavix.mypressonline.com/kiwenekoguvopuzuginom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xaduvegovoz.rf.gd/tujedew.pdfIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_2914a9c296c0439188951db26bd7c4e6.pdf?index=trueIn PDF document text
    • http://novisagaxorom.epizy.com/worenepaniteg.pdfIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_39df5dc3d457482e8f0a07045579b23b.pdf?index=trueIn PDF document text
    • http://kanosejimu.rf.gd/adding_mixed_numbers_word_problems.pdfIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_c4bfe9d37fa640c99168aaec08cd6e80.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_420a510dba0e45d084e4b1a4635a214f.pdf?index=trueIn PDF document text
    • http://gaderaxanaru.epizy.com/what_year_was_elton_johns_first_hit_song.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_off000133f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F0 5580 bytes
SHA-256: 5c97143e798175bde74423ce5f71df81d0b9241f13d206c0f3228351ea475d92
font_01_sfnt_off000146ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EF 10876 bytes
SHA-256: 3fa4bffab1f7f852dc5eaa546452280b080e9b8bf45560b70da28fb18aa14ef9