Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d4dc9ad25c82f3…

MALICIOUS

PDF

75.8 KB Created: 2021-04-11 13:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bececde34abf594c6a398be9da25f2c6 SHA-1: 28aa67a9d83100d6b7e16b7065d09546a88dbf2d SHA-256: e8d4dc9ad25c82f3d2de4c7af2833d7c0fa2094d90b71c7da178b796e23d8b6d
186 Risk Score

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 or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=give+me+liberty+5th+edition+volume+1+pdf+free PDF link annotation
    • https://tomolipuxoris.weebly.com/uploads/1/3/4/7/134708775/2332971.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479710/normal_5ff8b1298792e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387925/normal_601fab3fe54f7.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/scratch_flappy_bird_tutorial.pdfIn PDF document text
    • https://dunevija.weebly.com/uploads/1/3/4/3/134306837/52848a20c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372696/normal_603d80ec28072.pdfIn PDF document text
    • https://befukifesili.weebly.com/uploads/1/3/1/4/131453358/mekanexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_6039c77bc1ed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_60584b6ded432.pdfIn PDF document text
    • https://cdn.sqhk.co/rivinodati/ghRGGii/wars_of_the_roses_begins.pdfIn PDF document text
    • https://cdn.sqhk.co/votijavos/gjwiijN/environmental_scientist_jobs_colorado.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469836/normal_5feeb7d3e99da.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/34551845957.pdfIn PDF document text
    • https://cdn.sqhk.co/purorenutuw/ejdGHtZ/vetunetidure.pdfIn PDF document text
    • https://xafokevixutevib.weebly.com/uploads/1/3/2/6/132681308/sufepoxarujotan-kafuli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420034/normal_5ffd0061b080f.pdfIn PDF document text
    • https://vowagogo.weebly.com/uploads/1/3/5/3/135307183/dunodijo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_6010ee5547776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422637/normal_6041b7f49b0e5.pdfIn PDF document text
    • https://cdn.sqhk.co/vimanagadu/hgJqiaN/strawberry_shortcake_recipe_box_cake_mix.pdfIn PDF document text
    • https://cdn.sqhk.co/rovukupovumo/w7Yoie4/77598097199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454803/normal_5fe778a1dfee7.pdfIn PDF document text
    • http://peteferix.mypressonline.com/zeluwanit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rizivubonulej.atwebpages.com/93760767540.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CD 5404 bytes
SHA-256: abf3ef5826cfe248746516ee2d0595d80342b603b2086d98d567b6c227092770
font_01_sfnt_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 10400 bytes
SHA-256: 84af6c92995fdfcd7c566780e31268cfa137d4e36f299aed66edb70424530946
font_02_sfnt_off00010c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C16 16084 bytes
SHA-256: 29b8095464fa9501f2379a4c43ca3ba1b1df604f87f2abcbe11fa9bdafb8ec10