Malicious PDF — malware analysis report

Static analysis result for SHA-256 6602886fbc4df797…

MALICIOUS

PDF

72.3 KB Created: 2021-03-30 11:39:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ff74b1f806bf5fed27b4231ec4398cf SHA-1: 56d1bc7329f87e364523cc5dfd2ade1319868513 SHA-256: 6602886fbc4df79775ef2478c0b03fe9b03cbb3b93324335674bb5e97f104719
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 numerous external links, forming a link farm, with the primary URL being https://xajibur.ru/wix?keyword=ryobi+137r+trimmer+plus+parts. The document body is heavily obfuscated, but the presence of multiple external links suggests a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/wix?keyword=ryobi+137r+trimmer+plus+parts
    • https://kosipomorogimel.weebly.com/uploads/1/3/4/3/134307263/28edf7.pdf
    • https://kedadatiwuji.weebly.com/uploads/1/3/4/8/134891749/bazimegijawel_gasevo.pdf
    • https://cdn.sqhk.co/xixujipum/hZcnU5s/turbo_price_philippines.pdf
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/2502c563.pdf
    • http://pasikufopubiwo.mypressonline.com/20201926181.pdf
    • https://jawutasujo.weebly.com/uploads/1/3/0/9/130969833/zofijexokebawav_laliwanapal_famozijuxodo.pdf
    • http://desokore.medianewsonline.com/kufizonizilaruji.pdf
    • https://mijezuri.weebly.com/uploads/1/3/0/9/130969422/xozetufoxo.pdf
    • https://cdn.sqhk.co/diwidivu/jff65Bp/wisoliw.pdf
    • https://fibumexil.weebly.com/uploads/1/3/1/0/131070733/6569423.pdf
    • https://dunokosira.weebly.com/uploads/1/3/5/3/135349308/dikitumetebewo.pdf
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/wefowoliwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vovopafubipu/wiruke.pdf
    • https://s3.amazonaws.com/tuxalowafokuvo/cuantos_mililitros_hay_en_un_metro_cubico_de_agua.pdf
    • https://s3.amazonaws.com/xalexojaxipud/what_is_the_purpose_of_summary_judgment.pdf
    • http://xowilewegiwo.myartsonline.com/dametoxugiken.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_off0000da82.bin
3368202911a6f96ce8cb014d989e21188838a4a7b62aeb2df6d667dba4fae2a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 5508 bytes
font_01_sfnt_off0000ed3d.bin
c62d213f5c5ee137a6021db3195dc4a60d9267782292da4c9253f5742f198a15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 10944 bytes

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