Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef6d665f6d7d62d…

MALICIOUS

PDF

82.0 KB Created: 2021-04-20 11:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: aa6c5d1c7f93e9ecc5dd4d81bdcdabc9 SHA-1: 578423fef8c16bec1dc742d2c1fc188a988eb93e SHA-256: bef6d665f6d7d62da614542766120fbcccac49c3c0b1c9d06496c7416f2be54a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/strik?utm_term=introduction+to+chemical+engineering+fluid+mechanics+deen+solutions PDF link annotation
    • https://zejafopo.weebly.com/uploads/1/3/4/5/134505046/verimu.pdfIn PDF document text
    • https://roxejozojone.weebly.com/uploads/1/3/0/9/130969259/870cf0f03a1.pdfIn PDF document text
    • http://kayikciakademi.com/dave_ramsey_financial_planner_near_mevtnx9.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/5qjjagf/8963660299.pdfIn PDF document text
    • https://pojuzalik.weebly.com/uploads/1/3/4/2/134235388/4124621.pdfIn PDF document text
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/d6bfc38c436fd.pdfIn PDF document text
    • http://ita-bio.space/harbor_breeze_merrimack_ii_52-in_matte_bronze_led_indoor_outdoor_ceiling_fan_with_light_kit_5-bladehs311.pdfIn PDF document text
    • http://zoomita.fun/82267169310lp9u7.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/ztkdwjf/cake_decorating_classes_online_free.pdfIn PDF document text
    • http://operationhomeplate.com/kiwumozorizawusupuxoxojuh80nr.pdfIn PDF document text
    • https://kiwaluraxipexe.weebly.com/uploads/1/3/5/3/135326690/f9cc7790c01b7.pdfIn PDF document text
    • http://classkaod.ru/buputixikoborazejez.pdfIn PDF document text
    • http://triple-doska1.club/hard_christmas_word_search_onlineseii1.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/84636871368.pdfIn PDF document text
    • http://yewes.fun/fegoresekaxe5ry80.pdfIn PDF document text
    • https://cdn.sqhk.co/rikipago/5M4L1BR/43221110121.pdfIn PDF document text
    • http://3bki.ru/63202811881s5phi.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/78908982467.pdfIn PDF document text
    • http://okrasote.info/695403234248ko3f.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/sasolov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_1dd8315ed55343e0a1933353b02e21db.pdf?index=trueIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_aa6c07be3ee240fdb362d0e7cdc57a11.pdf?index=trueIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_c884ad3c69f24745925f9a0a2378dcd9.pdf?index=trueIn PDF document text
    • https://c9ecad83-e70d-4e71-84d8-0086c45344aa.filesusr.com/ugd/01a317_1f2e99b0ccdf43b2b858abe5c960eff1.pdf?index=trueIn 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_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 5372 bytes
SHA-256: 5ac5686545622a3afbc5474a65a3786ccf9589e6a7e1c229239111c2adc9e2cc
font_01_sfnt_off00011513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11513 10316 bytes
SHA-256: e3fbccea74b7ab9fd937fe5cfad1faf10b572df63f54c92abc1b4e69b3ddfa3f