Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c807b470025b98b…

MALICIOUS

PDF

76.6 KB Created: 2021-03-19 11:15:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 73d4ce5f66a052c5d6845a29eef23b18 SHA-1: fb7044a18c76473bc0ebd924cff96e217b30f133 SHA-256: 0c807b470025b98bc7bc64db2903b951c03a8ff4777c8a9f138e90163ed0ac13
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document, likely a spearphishing attachment designed to redirect users to potentially harmful sites.

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://jottigo.ru/123?utm_term=flute+duet+christmas+sheet+music+free PDF link annotation
    • http://tezijexipilimo.getenjoyment.net/fafsa_verification_form.pdfIn PDF document text
    • http://jewlgems.com/nekadebuzimuxaroletonoh9swo.pdfIn PDF document text
    • http://conicppjry.bid/dewalt_pressure_washer_manual_dxpw3425wrlds.pdfIn PDF document text
    • http://sufawevugut.mywebcommunity.org/north_atlantic_treaty_organization_meaning.pdfIn PDF document text
    • http://vseti.life/happy_birthday_punjabi_song_djyoungsteryf8en.pdfIn PDF document text
    • http://bestgirl69.com/60025383483ld7df.pdfIn PDF document text
    • http://bossyonlinex.com/why_are_hp_cartridges_so_expensivet5lkg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guxajez.rf.gd/placa_dentobacteriana.pdfIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_4ac6b47aa80e49cdba0463d9258ea384.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2823c739-1c84-4b90-b5e8-2963288570a4/graco_nautilus_65_3-in-1_harness_booster_car_seat_track_black_gray.pdfIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/78559587933.pdfIn PDF document text
    • http://bakilipos.epizy.com/karasurige.pdfIn PDF document text
    • https://ff5ab256-a407-4697-91b9-141751226614.filesusr.com/ugd/4205e4_9cb4cad0377d4f19ac4b2ea44a9204d5.pdf?index=trueIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_46eae8d454354cc5bc69a686b4879a32.pdf?index=trueIn PDF document text
    • http://bonizeza.epizy.com/cash_flow_statement_format_under_direct_method.pdfIn PDF document text
    • https://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_47ed772d15d74cb49159a0db3033e1d7.pdf?index=trueIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_a2dc9f759e314955b475e629396d0e94.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d794906-8f1f-44a0-897b-18b9a355b575/research_methods_in_psychology_online_book.pdfIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_ade474f4100d4e81bd85e54da7d7688f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef41280d-ba44-45ea-acf3-f0bbe4464863/sub_zero_642_review.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_bde3fe7c9b204f0d9cfbfb9e2fef2d50.pdf?index=trueIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_81354707794743edb0114b547af9ac05.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_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 5216 bytes
SHA-256: 4c5b5d5b4ec2e5278e50cc76d247c4d203cd7ba7b90491f632d3065fb9bcc587
font_01_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 10696 bytes
SHA-256: 0571d27c636fdab968d7eb496ccbfd074702be39e85adf93d97c404c64a22bd7