Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4f3724fa5b3c53…

MALICIOUS

PDF

86.5 KB Created: 2021-02-15 05:01:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 33fcd52f1e934aa6f037a31919310317 SHA-1: 0980fd0c890b150c18a4393ca23abc174d5b0878 SHA-256: ea4f3724fa5b3c53f67c92272a8390b147667f2726a728c430019fa81f8131fd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection tactics.

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=tfot+guide+2020 PDF link annotation
    • https://lomizagufefeg.weebly.com/uploads/1/3/4/0/134096038/3541418.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/jdehaje/golden_bubble_sort_expert_37.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/ihhaoic/1140685540.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/cGLgDhj/lego_marvel_superheroes_100_walkthrough_part_3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382784/normal_5ff25f713b5bc.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/Vghhcje/paint_mix_with_water_and_egg.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/icagd4T/81658451383.pdfIn PDF document text
    • https://fanarise.weebly.com/uploads/1/3/4/3/134377412/4a44a4ac89e0a0.pdfIn PDF document text
    • http://istlan.space/c_b_i_shankar_songsqbqwf.pdfIn PDF document text
    • https://nasuxixogidipan.weebly.com/uploads/1/3/4/7/134701521/zuretirorezalodapezo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460677/normal_5ff4d30375073.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fokibofu.epizy.com/mefitotuvanularura.pdfIn PDF document text
    • http://foxokaxej.epizy.com/wigiro.pdfIn PDF document text
    • http://pusujefizu.rf.gd/6th_grade_decimal_multiplication_worksheets_with_answers.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 4780 bytes
SHA-256: c94305dc4ac878429a33e0baf662ffc23a3c612d6a650674918319533ad18e2b
font_01_sfnt_off0001264a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264A 11080 bytes
SHA-256: e022d03c2bcb82dd3aa1fc913026e502db3dc1968792d66258bd7c6a2665f226

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