Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c837301513c715…

MALICIOUS

PDF

78.5 KB Created: 2021-03-24 22:43:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c1f63dc8373902aeffaaf9df370d5029 SHA-1: ec6de224544bb97fe421f348bfd04124ed679a23 SHA-256: 62c837301513c715f55a8292441d5a92e44e1516c8b93930b818b5e564650b6e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded URLs point to potentially malicious sites, and the document's structure suggests it's part of a SEO-based spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/strik?utm_term=fisher+and+paykel+fridge+manual+ice+maker PDF link annotation
    • https://zogugixuwomu.weebly.com/uploads/1/3/4/2/134234599/suxurokafugetaxabes.pdfIn PDF document text
    • http://kino-vezde.ru/alan_wake_pc_game_full_versionm5fro.pdfIn PDF document text
    • http://copyrighytsupport.com/5710433476sx2n9.pdfIn PDF document text
    • https://beveroseve.weebly.com/uploads/1/3/5/3/135316004/b95180b9e4313f0.pdfIn PDF document text
    • http://se-mrush.com/711339370888jjpi.pdfIn PDF document text
    • http://jefuxifutubanal.iblogger.org/igcse_physics_summary_notes.pdfIn PDF document text
    • http://lienforkid.com/27430891550a3bcl.pdfIn PDF document text
    • http://pubavamamuzagur.iblogger.org/what_is_the_12_day_smoothie_detox.pdfIn PDF document text
    • http://pivawazuki.iblogger.org/acc_lipid_guidelines_2018.pdfIn PDF document text
    • http://fakaremun.iblogger.org/answer_make_sentence_in_english.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/93eedcca-1838-4bc9-9fa9-70e65e28a08a/how_to_say_raven_in_spanish.pdfIn PDF document text
    • http://bifipibedulewu.epizy.com/twr_bible_quiz_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9915e1ea-b16e-4607-97d4-63bf45931491/mafegefusupidugidofodizup.pdfIn PDF document text
    • http://zumoriko.epizy.com/king_bed_sheet_set_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d5f881-b0c7-41d1-a05b-a12aded53409/69014657701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95882d8b-756d-4b0b-b2b3-d2a4bf2c2242/luwexibefidejutidina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c09d67df-9478-4f17-9763-4314a7e6f934/27016495650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3da365a6-1e31-4d14-9815-4e0584fca0fb/weber_gas_grill_cleaning_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09855d4a-5656-48a8-ab17-c4c46201a94f/brand_identity_simple_meaning.pdfIn PDF document text
    • http://pusagulubuke.rf.gd/baby_jogger_city_mini_gt_double_vs_gt2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/903c9dd9-cc19-4e9a-86b3-10d4cc8ef626/42125302030.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_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 5688 bytes
SHA-256: 58876c58f366d1b0f08f1be924241859517487d2eff10c2a13a3feb0af64520b
font_01_sfnt_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 10808 bytes
SHA-256: 526ff756cb148ae69d64a756b003649eb6625924a01c88f6a8485a65edc813b5