Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9f9f897cfacf0e…

MALICIOUS

PDF

70.9 KB Created: 2021-04-20 08:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: fe36ecddc16abee6abe64d08abb10db4 SHA-1: 198091152e136383dcad6795741c3efe164cba7e SHA-256: 8a9f9f897cfacf0e1e65daf3fd63b87edc4556582d43ac0ab9c7a9649a34c48a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains keywords related to search queries, indicating a lure to external malicious sites. The ClamAV detection and ML classifier strongly indicate 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
  • 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://xezojetit.ru/strik?utm_term=john+deere+mowers+prices+australia PDF link annotation
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/4484737.pdfIn PDF document text
    • https://defireser.weebly.com/uploads/1/3/4/3/134347292/a738b5df78ba.pdfIn PDF document text
    • http://mxbur.fun/what_does_it_mean_to_be_an_effective_citizen_in_a_democratic_society_in_the_21st_centuryecii0.pdfIn PDF document text
    • https://kenuzoba.weebly.com/uploads/1/3/4/0/134017938/naxixire-muxikum-birupinumi-kuludop.pdfIn PDF document text
    • http://pravagims.net/14725402551qagnr.pdfIn PDF document text
    • http://jewlgems.com/45820217982pzko8.pdfIn PDF document text
    • http://salonlabs.xyz/posabibixafodpm2hc.pdfIn PDF document text
    • https://niregesop.weebly.com/uploads/1/3/0/7/130776037/zumudakoz.pdfIn PDF document text
    • https://juniverobov.weebly.com/uploads/1/3/5/3/135317499/dovemotu.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/0e58e300-aa47-4ce8-80b2-76bfcc244d58/pistola_airsoft_spring_cybergun_sig_sauer_p226_slide_metal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/751568c9-eae4-4124-bf32-b2acb5727443/50211129130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16330a37-f24d-4089-8351-d2227ac91310/world_mythology_roy_willis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cab1e16-f70a-4bdf-b8cf-0b44ee1ff9bc/pexemubivumipi.pdfIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_776dd94ee0874519b52f2b6bbd52603f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e21cdf9-3c5a-4b94-91fb-4c8ba8059f69/27676857256.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_5b624aac3f834633a328ee46221f031c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a52e7c8-a466-4d4c-9557-dca421d14eaf/doxodexilaboxafobifope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56a955a4-0833-4805-b065-3653f4f3187b/98284157844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7dee5c5-6c67-46a9-b987-c3cd8f65da17/amazon_dark_tower_tv_series_release_date.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_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 5396 bytes
SHA-256: a0ab0faa8c7bec3e12bb9004f06c491b5291db64f695fe6cd76fcfaeb6ce88a0
font_01_sfnt_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 10604 bytes
SHA-256: 2fe10c5ac96659cd843b2dd720eef5889b6f11227552b6bdff2a3b0cb8582851