Malicious PDF — malware analysis report

Static analysis result for SHA-256 3889b86dcb3b68f6…

MALICIOUS

PDF

71.7 KB Created: 2021-03-12 19:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: d868557c7820e01b7ab92dd4bbd59425 SHA-1: 9fc0d0b8dd402fcf371444479295033bc90a7643 SHA-256: 3889b86dcb3b68f63661dd1ed8852105d98df448a16f84e2af5aa35c30eab2be
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=bluedevil+pour-n-go+head+gasket+sealer+16+oz In PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/8490690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_5fe972a89f58f.pdfIn PDF document text
    • https://xejigidusulup.weebly.com/uploads/1/3/4/7/134730122/nilododutabebupojad.pdfIn PDF document text
    • http://interplast.ru/begum_rokeya_university_admission_form_2018-_19gjxky.pdfIn PDF document text
    • http://5coupon.info/what_does_it_mean_to_fall_down_the_rabbit_hole9f2p7.pdfIn PDF document text
    • http://arenda-comp.space/how_many_quarts_of_oil_does_a_volkswagen_jetta_2.5_takel3yof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386335/normal_60393ba5828ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472753/normal_601972cd28887.pdfIn PDF document text
    • http://pedron.fun/66773042626y776a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450354/normal_6027398faed9b.pdfIn PDF document text
    • http://profyhouse.ru/happy_wheels_android1azwa.pdfIn PDF document text
    • http://electriccannoz.club/jelejikupujufeszfsyi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451217/normal_5ff2a1daae820.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/xoboxofikafizafnfn8u.pdfIn PDF document text
    • http://aires.fun/free_backup_software_for_android_phonesoheaq.pdfIn PDF document text
    • http://kismyketio.com/45404292532wt1t9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_6010a6c56dba9.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_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 5684 bytes
SHA-256: 20481a79bd9c8f7216cf58e80389e249af5f9e517fe139e3e987351d09f9461c
font_01_sfnt_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 10148 bytes
SHA-256: 0992386bdf76b18999856a49e9f20de13154aafc7a458bc8a0f7d6b1ecc8c391

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