Malicious PDF — malware analysis report

Static analysis result for SHA-256 6183edb13bbee37b…

MALICIOUS

PDF

77.9 KB Created: 2021-05-23 08:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4a79d83d0c332694fc8712917f0e6795 SHA-1: b372dea020435233dab1e6c1fecc05b473cbfeca SHA-256: 6183edb13bbee37bdbbf9722717ed0127fdcc79d159edac9f4f807bacbd9c68c
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially malicious or deceptive content.

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://druttle.ru/strik?utm_term=how+much+does+a+pony+keg+of+bud+light+cost PDF link annotation
    • https://dexuwoborusise.weebly.com/uploads/1/3/4/3/134375282/1804540.pdfIn PDF document text
    • https://xajixaze.weebly.com/uploads/1/3/2/3/132302973/ba9bb.pdfIn PDF document text
    • https://loreburanufiref.weebly.com/uploads/1/3/4/6/134694001/tobibazi-gekukivuvomo-zemokuvo.pdfIn PDF document text
    • https://tuvepovuno.weebly.com/uploads/1/3/3/9/133997374/2345927.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416154/normal_5fec4b2b87cab.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/8354344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413713/normal_6028f1b08a256.pdfIn PDF document text
    • https://kikafizujugu.weebly.com/uploads/1/3/4/0/134012642/xopizapamilupudawog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494891/normal_601386bc8fad7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451970/normal_606a8b5663524.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501495/normal_5fefd62db11f0.pdfIn PDF document text
    • https://menolalosixoj.weebly.com/uploads/1/3/4/7/134714047/lirasagozusino.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/1c779e81-2d0b-485a-b776-657dadebfd2e/spt_air_conditioner_and_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f788ea92-99fc-4eeb-9a71-c84f1531772b/alan_watts_death_part_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a55cb60b-e798-435d-afc5-b94eafcd23e7/what_to_say_instead_of_itll_be_okay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7a9964-93ff-4181-bda9-0ac2c5767ca8/tp-link_tl-wdr4300_hard_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd164c7-8b63-49ad-bb24-9d57885f05f5/zezepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aebf7af-42ab-4a10-9905-157ff442711c/whats_the_navy_slogan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9baa871e-6bf0-4022-974c-8bacad2da996/sig_p226_nightmare_9mm.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_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 5832 bytes
SHA-256: b555eaff3fdc0af56f74d911dcee452880c08a9438a0ce4867606c10e5038a3d
font_01_sfnt_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 11844 bytes
SHA-256: f0d989925cc17756feeb81d19b07843df058bfb2b6f76c2dc72ec154bd7a7220