Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc1c44e4d9683c3…

MALICIOUS

PDF

72.6 KB Created: 2021-06-10 02:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d0df84b0abc0c69e2ad09297d83e9a00 SHA-1: ceed53f0e8732a99f586448c3c8f43d88fd42313 SHA-256: 1dc1c44e4d9683c3c84538d097e78f9a6cbcce84770b393ee4515e7cf9315333
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://irlanc.ru/pbw?utm_term=shallow+mp3+lyrics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467945/normal_6060a6bb1e867.pdfIn PDF document text
    • https://podogavefa.weebly.com/uploads/1/3/1/4/131438056/39219.pdfIn PDF document text
    • https://pevarigemi.weebly.com/uploads/1/3/5/3/135303959/wimadigutanoxesazas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_60be141a20ec3.pdfIn PDF document text
    • https://fujinimozebuxe.weebly.com/uploads/1/3/0/7/130738673/888c2.pdfIn PDF document text
    • https://pawasisuleti.weebly.com/uploads/1/3/4/6/134652657/sojivama.pdfIn PDF document text
    • https://puzilefamurujuz.weebly.com/uploads/1/3/2/7/132712080/makilopitetomim.pdfIn PDF document text
    • https://kexazupaxi.weebly.com/uploads/1/3/3/9/133997339/vupupirux_kerule_fukobapeto.pdfIn PDF document text
    • https://bidukupe.weebly.com/uploads/1/3/4/3/134348295/dikamor-nosig-zorobobubonez-nafomemov.pdfIn PDF document text
    • https://paseselok.weebly.com/uploads/1/3/1/8/131858791/8b31940855690.pdfIn PDF document text
    • https://tefopopetu.weebly.com/uploads/1/3/7/5/137512768/1696491.pdfIn PDF document text
    • https://rakulemuvi.weebly.com/uploads/1/3/4/5/134506415/197302.pdfIn PDF document text
    • https://mepokebifonamos.weebly.com/uploads/1/3/4/0/134096039/6baabbb46a.pdfIn PDF document text
    • https://vitudanowule.weebly.com/uploads/1/3/5/3/135341415/4782780.pdfIn PDF document text
    • https://jasixuruvixu.weebly.com/uploads/1/3/4/2/134234618/9758561.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vatojorisa.pbworks.com/f/sevozekegejezolitakim.pdfIn PDF document text
    • http://fixulirulafa.pbworks.com/w/file/fetch/144495411/how_long_should_i_boil_ribs_before_i_grill_them.pdfIn PDF document text
    • http://pivumiraw.pbworks.com/w/file/fetch/144835095/icse_class_10_biology_practical_book.pdfIn PDF document text
    • http://vekunadugaj.pbworks.com/w/file/fetch/144942456/xezufawesanexubod.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_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 5632 bytes
SHA-256: e56f824827d1fc367332a3c44d5ce49ca9549ef651bfde70481ee06520031b9e
font_01_sfnt_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 11324 bytes
SHA-256: fd39ddf58a5620e48585792bf09e2c57da3e0f453cd41abb30cf9add3a1746f4

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