Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3728cce8e6d942…

MALICIOUS

PDF

77.4 KB Created: 2021-03-24 19:37:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 457aad2b12bb13777d131818d341e9d6 SHA-1: 78fb19cb265a1f6cf4f58abdf0d6838b153ec172 SHA-256: 6c3728cce8e6d942e99d74c85e949f67567cc15cb0fbb836266742d2b6f79c10
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable domains or subdomains. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. The primary function appears to be directing users to potentially malicious external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/wix?keyword=alliteration+with+sunday PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379049/normal_5fc765d7e43a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_6057092ab9a3a.pdfIn PDF document text
    • http://tiktokhd.design/63109293768knwbz.pdfIn PDF document text
    • https://sofirutowik.weebly.com/uploads/1/3/1/3/131381411/vatezaverukenejadow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477877/normal_5fde12dd8cbce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_603c497aa5752.pdfIn PDF document text
    • https://vozomazusow.weebly.com/uploads/1/3/4/5/134510153/2891343.pdfIn PDF document text
    • https://palujaburufo.weebly.com/uploads/1/3/2/7/132740236/zodalosib.pdfIn PDF document text
    • https://bafewalu.weebly.com/uploads/1/3/5/3/135350628/rugaxan.pdfIn PDF document text
    • http://investmag.org/control_system_theory_gtu_bookn1j1r.pdfIn PDF document text
    • http://sale20.site/63026055417tocxs.pdfIn PDF document text
    • https://jiparebifipi.weebly.com/uploads/1/3/4/6/134638028/bekomopotu.pdfIn PDF document text
    • https://bojurejid.weebly.com/uploads/1/3/4/8/134887271/42a3c6bad7343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480182/normal_6042b838c3994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421478/normal_603ad2de10c46.pdfIn PDF document text
    • http://lnstagramsupportlives.com/61019668633ejekd.pdfIn PDF document text
    • http://nashremont.site/tagalog_bible_old_and_new_testament_free_downloadxz8ge.pdfIn PDF document text
    • https://gojijaxokan.weebly.com/uploads/1/3/0/7/130739343/zixupafunu-jijox-meguwanafu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376612/normal_5fcaf734e98a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480895/normal_60036b8697afa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lopumupukerodu.epizy.com/8284185604.pdfIn PDF document text
    • http://kufilabed.epizy.com/zojodokugakofiko.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_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 5096 bytes
SHA-256: b67dc4e73fd3767baefb7ae5e40671d61e19aac02e8f03922128c25c5dca9d93
font_01_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 11064 bytes
SHA-256: 68eeba2d6645f71eab806215e9c6e0f56632bbc94df588d14c0c07eb3b49187a

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