Malicious PDF — malware analysis report

Static analysis result for SHA-256 03962e6613e7fb86…

MALICIOUS

PDF

75.0 KB Created: 2020-12-17 08:14:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cd09b6070193a9ed363380351edd228 SHA-1: 189ad13f61f71b1d1928d044e51bb69da7576554 SHA-256: 03962e6613e7fb861be405b53e2609b4622c6582d97c4f3b97ead169dfbcfd15
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The primary function appears to be directing users to potentially harmful external sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=uss+constitution+model+paint+guide
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/sunuz_sonakizuku.pdf
    • https://cdn-cms.f-static.net/uploads/4459937/normal_5fd93d09644f1.pdf
    • https://zifizegesug.weebly.com/uploads/1/3/4/7/134719454/jigudusewikij.pdf
    • https://rodugetimevo.weebly.com/uploads/1/3/1/4/131407281/4270853.pdf
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/6055623.pdf
    • https://cdn-cms.f-static.net/uploads/4458421/normal_5fbd55a8f23a1.pdf
    • https://wuwejinetuna.weebly.com/uploads/1/3/2/6/132681176/genoderorigomeb_wetebobufonesu_borarutozamu_pojuli.pdf
    • https://cdn-cms.f-static.net/uploads/4465012/normal_5fd67e1f797b1.pdf
    • https://sodukosikel.weebly.com/uploads/1/3/4/5/134598711/topedijebuburu_dubogowivu_molanilafuxi_jarax.pdf
    • https://gitokivoj.weebly.com/uploads/1/3/4/3/134316846/4151112.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6350140d-93a6-434b-ae1b-d79eb2b76aaf/gladstone_high_school.pdf
    • https://uploads.strikinglycdn.com/files/8912df4d-5f13-4054-ade3-8ecb9cb3f379/8412505344.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9e.bin
04feaa1a786190395f670fa34b75c77d387c345e990057e7ae372645f2586735
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 5288 bytes
font_01_sfnt_off0000fc90.bin
1c7647ebab32dd7157f3f8c1b4949dd5064eae663c2e8eda8d1e3cbd6ead8218
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC90 10220 bytes