Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12c40aa57f11f3d…

MALICIOUS

PDF

85.7 KB Created: 2021-03-31 05:39:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 83e476b5808bf644c81e18b49dd68cb5 SHA-1: 5944bc6736407c46823736373290aa8c4dd03f2c SHA-256: f12c40aa57f11f3dbfc0c896956a6fd64273f7a1a9f6f202da1070ac97fcfb30
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable or unknown domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/wix?keyword=marmot+ajax+2+tent+review PDF link annotation
    • http://prechambre.xyz/filmlinks4u.net_adults_englishrk5lm.pdfIn PDF document text
    • http://1xbet-registr.site/pikifabazafixudefugeri37m3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_60128dda3e75e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383322/normal_6013c6511227f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459029/normal_6031495b4cf3e.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/2ibihDf/23062865902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485149/normal_60266acddc057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410418/normal_6052e9eba1fb6.pdfIn PDF document text
    • http://nesobaka7.xyz/bardo_pond_amanitaugeyq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_60144895081cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465690/normal_602d38dd2508e.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/c5gfjey/descargar_jump_jump_ball_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_6018f422c7106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368477/normal_601d72dbb7e40.pdfIn PDF document text
    • http://tb-films.ru/what_to_put_in_sensory_table_for_toddlersnt1q4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_604988e813446.pdfIn PDF document text
    • http://mini-camera-super.club/vududilivotivozuwomef1bam2.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/ggignC8/42131233741.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9f1be152-2ea1-4306-981d-bfff62ad382d.filesusr.com/ugd/08fb22_7109ca2cdbad4ecea61a9b3c0de59063.pdf?index=trueIn PDF document text
    • http://katezoluvezile.epizy.com/familiarisation_trip_report.pdfIn PDF document text
    • http://fulapokop.epizy.com/resilikuvazakiw.pdfIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_547db967feed4ba8b53b4957c2433b72.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_d0cbe137bad44a788b355211856d672d.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 4844 bytes
SHA-256: 95b8f3e9cc8bc690323075c446aaa2cfaed44b6aea7e612dc9bdcccd2ed6934f
font_01_sfnt_off00011507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 11272 bytes
SHA-256: afd1031f200f72049c0c99bb80d76426f66d7ec0818e14283430a9fd78e784a4
font_02_sfnt_off00013b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2