Malicious PDF — malware analysis report

Static analysis result for SHA-256 283a04cade253e2b…

MALICIOUS

PDF

76.5 KB Created: 2021-04-07 07:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0f27452f8c04218bb25856503557cf9 SHA-1: 699ee0f7eb8e2bdb38950637c80dee613c1cc439 SHA-256: 283a04cade253e2bace7986c71bb02a069318ae9bbe5ba224039496247d39ecb
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, pointing towards an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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 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://mezovuduw.ru/strik?utm_term=what+to+do+after+the+advocare+24+day+challenge
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/pukoxepivut.pdf
    • https://static.s123-cdn-static.com/uploads/4382003/normal_6009157f1db2e.pdf
    • https://cdn-cms.f-static.net/uploads/4488103/normal_6064eb6219e69.pdf
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/1fccb69cd1b.pdf
    • https://cdn-cms.f-static.net/uploads/4459328/normal_606628ebcf178.pdf
    • https://xotagolopotipik.weebly.com/uploads/1/3/4/7/134713968/4d00a357be.pdf
    • https://vokavize.weebly.com/uploads/1/3/2/7/132710687/vejawux.pdf
    • https://cdn-cms.f-static.net/uploads/4469626/normal_60646184c120b.pdf
    • https://cdn-cms.f-static.net/uploads/4447434/normal_60217e6749640.pdf
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/xilovuv-lerub-jogakuxe-tolowa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_2ba265454be946629dbce505660cee3c.pdf?index=true
    • https://s3.amazonaws.com/vavapekadoliti/glitter_in_the_air_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/273318ac-3fbd-431b-9118-c425f035d9bf/pete_the_cat_school_shoes_animated.pdf
    • https://s3.amazonaws.com/wovigebi/91505290494.pdf
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_88825b471c484a768c05d16cde7b7508.pdf?index=true
    • https://s3.amazonaws.com/polexebuj/medoxegeveziris.pdf
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_4936022a138d422a9f07f8d2e637b185.pdf?index=true
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_821066016ecb4014996609fabb68a23c.pdf?index=true
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_adeb8a3095d848f9b34fa3f911c69dba.pdf?index=true
    • https://uploads.strikinglycdn.com/files/83c17859-333f-47eb-b322-3fa8007ebfee/what_are_the_different_types_of_abbreviations.pdf
    • https://uploads.strikinglycdn.com/files/e4e62be6-904d-4eec-9bfe-b949872506fd/6704138157.pdf
    • https://uploads.strikinglycdn.com/files/89860536-1605-45c9-8f0d-347d0aed32b8/macbeth_act_2_scene_3_and_4_questions.pdf
    • https://s3.amazonaws.com/turip/elephant_foot_yam_cultivation.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed12.bin
d78a9f25e8ab687fd3af35b2b29585f630493e58ba28c47b3ba91916f90147ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xED12 5500 bytes
font_01_sfnt_off0000ffe8.bin
7192b8fc4e3b033b7876dad7435ff5867ee9125c469bfa6b8086d8383fdf5d89
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 10616 bytes