Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b80881f22bf657…

MALICIOUS

PDF

73.9 KB Created: 2021-06-03 23:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22afe2f9a4eaf4a94dc9f10fe149c683 SHA-1: 7c7b6da22e815ce807ec560cac8af7c77e0708a6 SHA-256: e3b80881f22bf657f22673fc0806604e648b83af6ded560f7866df504458bbb9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, directing users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/pbw?utm_term=volatility+index+100+trading+strategies+pdf
    • https://nudimulax.weebly.com/uploads/1/3/6/0/136010194/xozewezeno.pdf
    • https://static.s123-cdn-static.com/uploads/4481411/normal_5fdc9f4d27fb6.pdf
    • https://cdn-cms.f-static.net/uploads/4487663/normal_60352689b4090.pdf
    • https://cdn-cms.f-static.net/uploads/4371265/normal_6029d0ee32ab5.pdf
    • https://fibexijenoka.weebly.com/uploads/1/3/2/6/132680926/sowelibopoborosef.pdf
    • https://cdn-cms.f-static.net/uploads/4402032/normal_602946d2507ca.pdf
    • https://cdn-cms.f-static.net/uploads/4459623/normal_604eecea02186.pdf
    • https://static.s123-cdn-static.com/uploads/4482619/normal_5fc9c77352cb0.pdf
    • https://bapizemu.weebly.com/uploads/1/3/1/1/131163962/4099358.pdf
    • https://cdn-cms.f-static.net/uploads/4500665/normal_606d66fdceb85.pdf
    • https://cdn-cms.f-static.net/uploads/4486969/normal_606a7f3f8298d.pdf
    • https://kofemadaki.weebly.com/uploads/1/3/4/6/134675418/861744eb.pdf
    • https://cdn-cms.f-static.net/uploads/4388413/normal_6044418c881c4.pdf
    • https://vewewiganivobob.weebly.com/uploads/1/3/4/8/134852084/7429323.pdf
    • https://fomuropuzukamu.weebly.com/uploads/1/3/4/7/134728801/2fb6185.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/78c28108-7d58-4040-8543-e3565ea5ef8a/xotedijisibozataleweravaj.pdf
    • https://uploads.strikinglycdn.com/files/266e7c4d-45d8-4a62-8f3d-8fb2bb64a834/write_a_conversation_between_two_friends_discussing_their_holiday_plans.pdf
    • https://uploads.strikinglycdn.com/files/85a1b7ee-ac7e-48e2-8291-f0ef9d20857a/leading_change_why_transformation_efforts_fail_harvard_business_review_january_2007.pdf
    • https://uploads.strikinglycdn.com/files/228bb853-3af4-4ef2-bb34-97e01bed3b81/molecular_cell_biology_and_physiology_jobs.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e25e.bin
e5e8fe9156412344d6a00a3bfa549f11868398e9efae3b455eacf7b519cbec71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 5540 bytes
font_01_sfnt_off0000f560.bin
53e0f7dd1b25dd9c9aed1e93a83d9c2c61343fa746e14c286642a6e6cdf8f7bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 10892 bytes

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