Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db529f867fc6f4f…

MALICIOUS

PDF

74.5 KB Created: 2021-03-21 09:56:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6dc35772a6243413afadd51c6e116bf8 SHA-1: 220c880b64ec1f8d91d6999497c5ca83e031a679 SHA-256: 2db529f867fc6f4f638c2896ba7eeaa134ef17f7a71f09439d15a407e3f6e7bb
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the primary URLs, 'https://xajibur.ru/strik?utm_term=vitamix+a3500+ascent+series+blender+best+buy', appears to be a lure for product searches. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 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://xajibur.ru/strik?utm_term=vitamix+a3500+ascent+series+blender+best+buy PDF link annotation
    • http://keruluzo.medianewsonline.com/58903632033.pdfIn PDF document text
    • http://wepalulinoviwo.iblogger.org/wimipigulunu.pdfIn PDF document text
    • https://gobodukigibab.weebly.com/uploads/1/3/1/8/131856162/8911677.pdfIn PDF document text
    • http://kalowodopole.mygamesonline.org/2017_amc_10a_solutions.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/49245540768.pdfIn PDF document text
    • https://serutoposax.weebly.com/uploads/1/3/5/3/135398922/8452959.pdfIn PDF document text
    • https://lodotimafigu.weebly.com/uploads/1/3/5/9/135981467/279771.pdfIn PDF document text
    • https://mavosawiki.weebly.com/uploads/1/3/1/1/131163846/sibof.pdfIn PDF document text
    • http://romabeveseruzor.22web.org/whirlpool_fridge_20fdbm_manual.pdfIn PDF document text
    • https://vesedosaripiwuj.weebly.com/uploads/1/3/1/6/131636692/nezolesuvetek.pdfIn PDF document text
    • http://morasuxod.getenjoyment.net/rhcp_californication_tab.pdfIn PDF document text
    • https://semototip.weebly.com/uploads/1/3/5/3/135386148/tazifunav.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/liraro.pdfIn PDF document text
    • https://xuwulusepe.weebly.com/uploads/1/3/5/3/135310973/sagesovozenaj_kojixadegos_kirurimadega_niguti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xobeminal.atwebpages.com/geretaduleti.pdfIn PDF document text
    • http://pimoxonevuwewax.atwebpages.com/all_of_me_jazz_guitar_tab.pdfIn PDF document text
    • http://zelobiliteriwe.rf.gd/nebizajavasumasonekipil.pdfIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_62f1934fc8aa4f168738a8e6fe7e6857.pdf?index=trueIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_56ffae6f5d3f438c891effa29a849318.pdf?index=trueIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_096985b3352841e8a6edc95935176c89.pdf?index=trueIn PDF document text
    • http://nanaxidimidi.atwebpages.com/69404453471.pdfIn PDF document text
    • http://tapanowi.epizy.com/what_score_do_you_need_to_pass_road_test.pdfIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_b62eb8cedb5a45eca7e0a19062c9ba3a.pdf?index=trueIn PDF document text
    • http://bejutamukedus.epizy.com/hindu_baby_boy_names_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 5560 bytes
SHA-256: efd9befcb2ce2c02fadb35ea73604ef37fc43b078f17bc541ba9733756409fc9
font_01_sfnt_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 10448 bytes
SHA-256: 167c1ea10bd9acbca443d6df0f03a334b9a8066bbc49a5104e1ce767478e20b7
font_02_sfnt_off00010c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C60 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f