Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf31d664b73a6f4…

MALICIOUS

PDF

69.8 KB Created: 2021-03-15 19:47:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c157211bcea8d99c0d37fa931527372a SHA-1: e6af67d8d0dc73dc6d5ff53dcbc2dd66792fb062 SHA-256: baf31d664b73a6f477966ba542c6d451bc7f8a12279002345e25baab0eb29adb
186 Risk Score

Malware Insights

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

This PDF file was flagged 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 used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a popular coffee drink, likely intended to trick users into clicking the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=medium+french+vanilla+iced+coffee+with+almond+milk+dunkin+donuts+calories PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474205/normal_601fa1aa4f85f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446643/normal_600aa388b8a26.pdfIn PDF document text
    • https://wavixozuxukoreg.weebly.com/uploads/1/3/1/3/131380445/rirojufuzomeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416932/normal_6034f21cada6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459922/normal_6021c2cd1fba5.pdfIn PDF document text
    • https://cdn.sqhk.co/xumifutave/ehb1he0/theme_for_oneplus_6t.pdfIn PDF document text
    • http://samyog.ru/back_to_school_checklist_for_studentsrywfc.pdfIn PDF document text
    • http://ses-paypal.com/zebifixolefmmt0.pdfIn PDF document text
    • http://wellwork.site/google_earth_marine_navigationvv1mp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476943/normal_6035ad19e2871.pdfIn PDF document text
    • https://nupepapuk.weebly.com/uploads/1/3/1/4/131484133/6086808.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewakuw/dheiahh/the_world_wars_episode_3_never_surrender.pdfIn PDF document text
    • https://funavekun.weebly.com/uploads/1/3/0/9/130969801/4190192.pdfIn PDF document text
    • https://nujobivodiji.weebly.com/uploads/1/3/4/7/134771327/a08186d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373779/normal_5ff79c50dab62.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/261637137971xsv.pdfIn PDF document text
    • https://jawanowek.weebly.com/uploads/1/3/4/3/134356941/tokomoba.pdfIn PDF document text
    • https://cdn.sqhk.co/miviterul/fJU9hgT/zeferef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_60445efec759c.pdfIn PDF document text
    • https://cdn.sqhk.co/legezuseg/sgihcge/factory_inc_cheats.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/3b0ae415-2e2f-4792-856b-44184213b004/85493135342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23dd100a-c306-4b7a-b120-d889bb3ea5c5/38095341372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6dc4da7-bea2-4d21-868e-f82659971504/how_do_i_setup_my_canon_pixma_mg3122_wireless_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c385d4b8-865d-4110-b3ba-1c0890f02f09/what_is_the_whole_serenity_prayer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ab9328-f7f1-49b6-84ad-08ea6892ac01/what_are_the_composition_of_renaissance_period.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_off0000d57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57C 5484 bytes
SHA-256: 40c92a8866f42c6833812649d4a773210acc1d8e3b2b8b7faa7e0293b975cb94
font_01_sfnt_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 9544 bytes
SHA-256: 76d2a3e231f4d6d9222637588ac0a81591d79224c5f4dd558efaab63560505f3