Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2a1728fa2a3492…

MALICIOUS

PDF

74.1 KB Created: 2021-02-27 00:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 14e958bc0b4d6e30fd42979f57f21a75 SHA-1: c7bd4ea4abe7dce4f85a97b7f53a7fea8cbe8ed7 SHA-256: ca2a1728fa2a34925f3c18e6034b93070df22b2d9106af6f20761635172cf1a7
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 domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier also strongly suggest malicious intent. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malware.

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://fokemale.ru/aws?utm_term=how+to+connect+bluetooth+headphones+to+samsung+smart+tv PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387706/normal_5feec02ac9b7f.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/UgdRieg/drastic_ds_emulator_download_windows.pdfIn PDF document text
    • http://mabay.fun/letasoft_sound_booster_free_alternativeckx1u.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/jdgcvhd/94874324115.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/Isdhfge/pigakojaxuloboxasaxifor.pdfIn PDF document text
    • https://pubabugolutaj.weebly.com/uploads/1/3/2/6/132680974/861958610216.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427103/normal_5ff4275a2c6bf.pdfIn PDF document text
    • http://sks-expertiza.ru/methods_in_enzymology_bookxiyka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500895/normal_600aa160ec46b.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/jhfSBha/90951391637.pdfIn PDF document text
    • https://gemirolav.weebly.com/uploads/1/3/1/6/131606407/wunineg.pdfIn PDF document text
    • http://youla-24.cc/rujavazizekulufutuxosiduep2sg.pdfIn PDF document text
    • https://gafewifem.weebly.com/uploads/1/3/1/3/131379815/pebusopoterake.pdfIn PDF document text
    • https://cdn.sqhk.co/wozepefiga/kjaJjfb/metrozone_fortune_cookie.pdfIn PDF document text
    • https://foxodutamawasu.weebly.com/uploads/1/3/4/5/134587344/6d8d1a59ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 5740 bytes
SHA-256: 6618e99cda0ecb066ce8d77f7f90615f4432759916b7d7f3f78d5bf4ebc63475
font_01_sfnt_off0000f658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 10896 bytes
SHA-256: ff32f1e51b5c0d6c120058c922613ef2aab89f4b92bbc06c4858d9cfdf035510

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