Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c9f3e4b0c89bb2…

MALICIOUS

PDF

73.6 KB Created: 2021-03-27 14:30:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 72172a7d434833967693d944543a6cff SHA-1: d18698984298e53ed5278671a671b08b4114061e SHA-256: 45c9f3e4b0c89bb2f25dcad283febaea4da381e95a5984cef81efbfb4a0d7989
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting or suspicious domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/123?utm_term=dolby+atmos+android+root PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5fd67778da789.pdfIn PDF document text
    • http://outputqwvk.space/rudawalelakedemageh085q.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/94645621045zuouy.pdfIn PDF document text
    • http://savigekefove.iblogger.org/how_to_describe_stars.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419225/normal_5febc7a56e90a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487662/normal_604a4ca124c54.pdfIn PDF document text
    • http://bezprovodov.guru/blackmagic_design_atem_mini_live_production_switcher_review77pm9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f5d5bca3-0ffd-41e3-a77d-3d805a1e43e5.filesusr.com/ugd/4e23ca_5ab37c4343d3495d89352b7e6a35c422.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_65981cdd470d4c5d898472b9ceab73d3.pdf?index=trueIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_3796b00a0f924cde8b1470b6193ca21f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cc59af7-56cd-4505-bcad-4b17de58df22/48585520816.pdfIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_daf2c64f27f5424d8762d06ac2b9a165.pdf?index=trueIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_3d82ac2363244f1b832410e4f657866b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4901f3e-c0fe-4d79-8b1f-b2007be01f97/hp_g42_motherboard_price_in_india.pdfIn PDF document text
    • http://titasukutisun.epizy.com/restore_deleted_text_messages_android.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_a02b3ed43a7440f380240b4e255bf6b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed5fe267-5da0-4973-ba69-248214d05fcf/how_many_calories_in_a_chicken_taco_bell_taco.pdfIn PDF document text
    • https://f33eab34-52c4-4f1b-91c9-7c5ec1255b8f.filesusr.com/ugd/9d0374_c0cd22a24e0542eda81b4bfd39410e9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c68233c4-d314-4428-89a6-644e37197f24/when_should_you_make_your_relationship_facebook_official.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_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 5212 bytes
SHA-256: c282438e5b3a420df7cfb1e575b891f5f2e2a13a28231a22812cd1c246283615
font_01_sfnt_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 10436 bytes
SHA-256: 56a3565b7f87cbd522b016e9b356be07cce156c77b10686492e7d67e00114abe