Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8aef1d482cde9c4…

MALICIOUS

PDF

73.2 KB Created: 2021-06-05 15:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f85d47dc7b2bbbade7ec6012b5eb7c55 SHA-1: de3b0c6409638b38edaaa18236d0e1ba2bab392d SHA-256: e8aef1d482cde9c448905027045761464fb0c05ca7b83912faef8b37f392b019
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-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://oniceh.ru/pbw?utm_term=poulan+chainsaw+service+manual+pdf PDF link annotation
    • https://zadilomevesijob.weebly.com/uploads/1/3/4/5/134581884/4504260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_6068544ac36b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480174/normal_5fc7538651a90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501214/normal_601bbd992ef89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488137/normal_5fe5892c42af0.pdfIn PDF document text
    • https://guveroza.weebly.com/uploads/1/3/4/4/134484502/f843e67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489717/normal_5fe06324430fb.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/9c649528-fc3b-4dab-b963-69283a562913/our_troth_history_and_lore.pdfIn PDF document text
    • http://juwelite.pbworks.com/w/file/fetch/144543639/megezitakim.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/w/file/fetch/144419886/which_country_was_not_apart_of_the_triple_entente.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b20d23-20b7-44c3-911f-79ec1fc28d8c/les_miserables_concert_2019_tickets.pdfIn PDF document text
    • http://bukafag.pbworks.com/f/60998779385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80e1f181-8e96-4a02-b222-08616dffc406/zijalosukini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e28cbec-b732-4aee-a0e4-6a360da27fe8/what_is_the_order_of_the_maximum_ride_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef24126-8b2e-41d5-a44d-7f9295fc2fff/69937916724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4375a768-6cc9-4912-ba9f-4d1ce977b5b3/rca_lyra_mp3_player_driver.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/w/file/fetch/144514605/how_to_use_dentek_repair_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/debad6a4-c0d7-4c24-8fde-d9ab83e23738/what_is_the_meaning_of_cadastral_survey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc6e911-ff3b-421f-aaec-b8822ce481b7/rapesalobafabixav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/498b9aef-8c09-49fa-9b37-d226644814f3/teril.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/124a4c6b-d390-4d13-a89d-d53734d4cd9f/buy_tinder_gold_promo_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dc166db-a782-4855-a8fe-f17ef3f26151/53453567107.pdfIn PDF document text
    • http://pajinap.pbworks.com/w/file/fetch/144497898/75312019037.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_off0000df61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF61 5548 bytes
SHA-256: 9f86264894330963b75a39ded1c95d89a7accef75786378236126517a5d8df0d
font_01_sfnt_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 11032 bytes
SHA-256: b4320003b527903f7312344cf00a33e6ca34d70dbdcc582a1993641480eae301