Malicious PDF — malware analysis report

Static analysis result for SHA-256 357358dfba6e086b…

MALICIOUS

PDF

63.4 KB Created: 2020-11-25 21:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9a13cc935a1e363fa15beb2b04df28fb SHA-1: 32ff17dabc6576a0084f1df7bd0fc4d0516e08e5 SHA-256: 357358dfba6e086b0e8be1ec1bcfaa995ca7e69ffaf2b47f6bee814fcd4b212f
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm for SEO manipulation or phishing. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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=rachael+ray+chili+recipe+30+minute+meals In PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_5fb56383a03ec.pdfIn PDF document text
    • https://tefizaset.weebly.com/uploads/1/3/4/5/134587169/tugiwixutapado_pifufux_jikivoxinoka.pdfIn PDF document text
    • https://dixaxotobaba.weebly.com/uploads/1/3/4/3/134377978/tigig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_5f8904967596b.pdfIn PDF document text
    • https://rujenamifib.weebly.com/uploads/1/3/4/6/134652207/mumalajiwim-tajumakopasudul-bumokosapib.pdfIn PDF document text
    • https://nadepopuzoli.weebly.com/uploads/1/3/4/6/134611029/7945323.pdfIn PDF document text
    • https://jojurofi.weebly.com/uploads/1/3/4/6/134666092/wexube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_5f8ff8e69fe0d.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/nuwezero-bosilopiw-zeragupefeb-busexexino.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e16312f3-fd07-4f01-ad42-53739c051de0/virasawumeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65743b5d-e5a6-4c1c-a412-ee121a44d8ca/cch_lm_cm_chy_ch_bng_si_gn.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_off0000bac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC9 5588 bytes
SHA-256: 19232a28ef328d18371ac1d3773122b645918d7c01991adaf24f81847fdc791f
font_01_sfnt_off0000cda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA7 10840 bytes
SHA-256: a16fdf6bb4efdea816aab56440e7f63c3b3e0159742f3dfd12ac4471e3469df4

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