Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f41b1f34a3d3d6…

MALICIOUS

PDF

75.3 KB Created: 2021-02-25 02:41:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1dcefbc6c9a7302a10314f4d2336ead4 SHA-1: 808abb7c73d7400f6f4ca4a1c31f721363aa94c8 SHA-256: 78f41b1f34a3d3d6414fb679f33bc657a4022b0c7a84c1e2392c382cd5811535
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 pointing to disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or exploitation.

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://druttle.ru/strik?utm_term=hop+on+pop+dr+seuss+book PDF link annotation
    • http://vbruti.site/lingua_latina_answers4aexk.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/jRggjbu/pefitufedebofagomozi.pdfIn PDF document text
    • http://moresukko.ru/foxakij8i4s.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/gihHjcQ/79833233523.pdfIn PDF document text
    • https://zawibovime.weebly.com/uploads/1/3/2/6/132681883/9551794.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/chcaibp/best_transmission_repair_fluid.pdfIn PDF document text
    • http://garant-ritual.online/california_ab_60_requirementsj80pi.pdfIn PDF document text
    • http://nuderoxaxik.22web.org/ableton_live_9_lite_full.pdfIn PDF document text
    • https://cdn.sqhk.co/negapevu/RjaAgfD/tuwirovosuz.pdfIn PDF document text
    • https://cdn.sqhk.co/penazavoxu/fichh7F/88453064158.pdfIn PDF document text
    • http://alexandreablog.com/437297372522axw6.pdfIn PDF document text
    • http://idealicacolumbia.site/zexulegalepebagofamydshl.pdfIn PDF document text
    • http://love-your-lips.online/88887766553pxerf.pdfIn PDF document text
    • https://xidelesa.weebly.com/uploads/1/3/4/4/134498911/winibirijisanevomaru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viwukapatajomi.rf.gd/wordscapes_uncrossed_level_97_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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 4876 bytes
SHA-256: f6c639e9f4e7dbd3c9669b7c34941ff0ef2a2f65da065370e281085f1c3ae590
font_01_sfnt_off0000fd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 10240 bytes
SHA-256: b7be8890b588af972d161d3d114ce1883b63c9cb8839cf67443974d2cf1ce8af

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