Malicious PDF — malware analysis report

Static analysis result for SHA-256 8754067dc3e48833…

MALICIOUS

PDF

78.9 KB Created: 2021-02-11 11:53:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3bd40e97ce7ec6c36577f716e8ce54bf SHA-1: d20294f095bb33bdc25108761b2cbe308d754165 SHA-256: 8754067dc3e488333d3bbb048a3d7024d964e3e1fa864ddf30fb8b9812c1375c
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://jottigo.ru/123?utm_term=woodchuck+chipper+service+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496592/normal_5fda20ca22557.pdfIn PDF document text
    • https://zubotovilep.weebly.com/uploads/1/3/4/5/134581484/4238dd2b4d.pdfIn PDF document text
    • https://cdn.sqhk.co/lilovenodi/zyhgHgj/wikevudemu.pdfIn PDF document text
    • https://cdn.sqhk.co/nojumuku/jYsrjaz/pirates_of_the_caribbean_6_imdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422161/normal_60215f3f9a360.pdfIn PDF document text
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/dee4ef868a.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/0giFheS/dosiviwa.pdfIn PDF document text
    • https://geguwuwivoloko.weebly.com/uploads/1/3/1/6/131636947/1864814.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417986/normal_5fd08a7ca1965.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527747/normal_5fc906e00c074.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368237/normal_5fed755344bb6.pdfIn PDF document text
    • https://cdn.sqhk.co/zadorari/iYgjbjj/dizorexixesuwof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408324/normal_5fc78f5a3b54e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_6022c930cacad.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/hjfAcSk/ringtone_maker_from_youtube_app.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/fosebalos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377391/normal_6005519d97a6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/legesiliv/69438728619.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/80437928218.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/shinchan_tamil_episodes_free.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_off0000f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 5448 bytes
SHA-256: b7804cdb8ba8042e33fb7db6df7f8ae050e102d58674bd77a24a4ff68c609b12
font_01_sfnt_off0001077f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 11656 bytes
SHA-256: 79b1a4730e060bf6e62f3bdbdaaeae1ef262c4a76f6452a4222dd1f64f91356b

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