Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fb2573027dee5a…

MALICIOUS

PDF

71.2 KB Created: 2020-11-17 06:46:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3686e2cb3f3467e366d7404fe055c2e SHA-1: 15e47039d8fd76bef4f4090c15181fcaed9e3724 SHA-256: 78fb2573027dee5ae7bd58b6306e45c813eab2b8232a79da186d077b8b044ddf
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains a large number of external URIs pointing to various websites, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of 'utm_term=schoology+st+johns' in one URL hints at a potential phishing lure related to educational institutions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://traffine.ru/123?utm_term=schoology+st+johns
    • https://gifalixes.weebly.com/uploads/1/3/4/5/134593917/nolibu.pdf
    • https://cdn-cms.f-static.net/uploads/4405904/normal_5f920b60dab53.pdf
    • https://xesapidad.weebly.com/uploads/1/3/4/3/134346602/figamuzu_vidato_sarasijodumoruv.pdf
    • https://genamimiwovem.weebly.com/uploads/1/3/1/6/131636881/poxupebafixun.pdf
    • https://lajogaful.weebly.com/uploads/1/3/4/4/134481829/8889721.pdf
    • https://rexolofozex.weebly.com/uploads/1/3/4/3/134368018/kalikokefupis-ripejavev-junepefoji-bogadobimu.pdf
    • https://tejovobomogopiz.weebly.com/uploads/1/3/4/6/134626725/40b2fac11.pdf
    • https://vowijavig.weebly.com/uploads/1/3/4/3/134319359/cdb93a88b44363.pdf
    • https://nujidigazinuwag.weebly.com/uploads/1/3/4/3/134318548/1901325580e5.pdf
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/772b57b182c6abc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/36d0a070-947f-4c06-a7dd-959ab83bec80/24161151263.pdf
    • https://uploads.strikinglycdn.com/files/1e8e6616-47c9-46d5-af92-5c98321f5ee5/headfirst_slide_into_cooperstown_on_a_bad_bet_music_video.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc1c.bin
62717fabdaa691d968f4b313c9e29f0f5d80b310313741e039089183aa11d66b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1C 4656 bytes
font_01_sfnt_off0000dbee.bin
71a6bc05fe56e33562823ebdb2cf5f27cfa7a1b32d40d21691d1049530e1386f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 11380 bytes
font_02_sfnt_off000101ff.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x101FF 4324 bytes