Malicious PDF — malware analysis report

Static analysis result for SHA-256 139875dd015d2a90…

MALICIOUS

PDF

86.4 KB Created: 2021-04-15 11:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 71821b64e9e69b5127ec2773f5caac25 SHA-1: c70549843f82f8e22b889354687638640cab56c7 SHA-256: 139875dd015d2a9067863de7331605a0342d3fdfc6b7f0a3ef28cd77cd636591
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, and the presence of embedded URLs supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/strik?utm_term=asus+p8z68-v+lx+motherboard+drivers+download PDF link annotation
    • https://pepevifive.weebly.com/uploads/1/3/4/4/134480859/6435109.pdfIn PDF document text
    • http://jabewes.medianewsonline.com/shoe_catalogue_design.pdfIn PDF document text
    • https://setojeduvesile.weebly.com/uploads/1/3/4/5/134587971/veposaz-xifezelub-jonufomeviju-vuberates.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/vyasaraja_mutt_panchanga.pdfIn PDF document text
    • http://fidekeleko.medianewsonline.com/africa_countries_and_capitals.pdfIn PDF document text
    • http://levotavo.scienceontheweb.net/accords_ukulele.pdfIn PDF document text
    • https://cdn.sqhk.co/zitedefew/lhcT64R/puxuzisoxabiga.pdfIn PDF document text
    • http://delinapod.mypressonline.com/rendezvous_mit_rama.pdfIn PDF document text
    • http://juxumigine.mypressonline.com/kosemekalefopa.pdfIn PDF document text
    • http://bodaweziwov.mypressonline.com/49716833921.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxazazul/mpjcmha/free_printable_color_wheel_template.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/61720526209.pdfIn PDF document text
    • https://xipowabiwakazo.weebly.com/uploads/1/3/4/6/134614187/kasudesazibamafozed.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/tc_electronic_polytune_2_mini_vs_noir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_fe8e6c2418f84553b7f8574a5625d3a7.pdf?index=trueIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_9af92163f2f74bdb9cee43651fed6f84.pdf?index=trueIn PDF document text
    • https://e108c0fa-8e70-4110-aab7-e0d30777705f.filesusr.com/ugd/d9966b_5e8aaddb944f472686a9a46ab5a2b224.pdf?index=trueIn PDF document text
    • https://2e21b658-2967-4279-8f18-a03590b678a5.filesusr.com/ugd/f5e1b2_03afd45c7a3b42479d7eb2ed9abb36e6.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_59893694f0bc4845b88673cbbb537638.pdf?index=trueIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_af2ac12ff94042c59503c135095d9f25.pdf?index=trueIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_0cc921045d8d490e98d635c195bee39e.pdf?index=trueIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_429d34435a4b442fb06d8d3378b53651.pdf?index=trueIn 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_off0001123e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123E 5980 bytes
SHA-256: 09b1c71ebb1541b41a55608e9af92d18170397d0804cdecc26bbc0af4d2a8552
font_01_sfnt_off00012689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 10844 bytes
SHA-256: 85278260309d6bf5662204a161716c8b77b0c816a3d9e49f86dc4615b9b9ff82