Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2339f258b536dc…

MALICIOUS

PDF

63.7 KB Created: 2021-06-09 10:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ca4ab5d44c51049a8944a178e3980dc1 SHA-1: 8822fb244993af03928a9ea70665716ad205d2b8 SHA-256: bc2339f258b536dcea81e61a871b2967589eb81799b30d9ab038c67905cda095
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The primary URL, https://allytemp.ru/pbw, appears to be part of a link farm designed to manipulate search engine results or direct users to potentially malicious content. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9635

Heuristics 5

  • 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
  • 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://allytemp.ru/pbw?utm_term=how+to+get+meowlotov+cocktail+mhw PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387054/normal_602ba83f60b3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531626/normal_5ffb7428f1a55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_60637a505f167.pdfIn PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/3cdee604055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_6059f187c60e1.pdfIn PDF document text
    • https://dowawanezezezo.weebly.com/uploads/1/3/1/0/131070762/vubiwukozij-lilinudezowaxis-rerupe.pdfIn PDF document text
    • https://vurigejowuzebad.weebly.com/uploads/1/3/3/9/133997249/b0764df9c1a654e.pdfIn PDF document text
    • https://bijazebis.weebly.com/uploads/1/3/1/3/131382141/mafovisugo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463279/normal_6000032fba4c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/144566127/79305785991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/154fd77b-7695-4149-8a92-55fd5353f491/telhamento_de_aprendiz_para_companheiro_maom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/623cf0f4-1f57-44b3-859f-f197f31ab004/blackberry_classic_q20_buy_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8703e331-7136-41dc-871b-cd24d43d1366/how_many_calories_in_a_breakfast_burrito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c824cafc-0db1-4982-ab99-c20c8e659951/labexujasokuxe.pdfIn PDF document text
    • http://jetubabup.pbworks.com/f/14843515909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/accd0308-c741-4d09-9056-f492adb076d4/how_to_answer_summary_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7da4f39c-fbf0-48c1-9574-37219501a886/nuwalopozatolewunefowe.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/w/file/fetch/144505539/2008_hyundai_tiburon_repair_manual_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d564f5f-adc5-49ef-9d5d-e809d4c73a5e/what_is_independent_and_mutually_exclusive_events.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d5daa86-2861-4f29-9dcb-9a303005fbe8/idle_hands_are_the_devils_workshop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c07e91a-4dd5-40b8-819f-8dd013f5e773/gavipetu.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 5116 bytes
SHA-256: 31add17ab65633f84fbe37542eac2afcb05aa210af2d24d228ebb08d10c58390