Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57707d5818e9c5c…

MALICIOUS

PDF

76.2 KB Created: 2021-03-09 11:12:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6d2c7ea30545312d4a62e584d2510c49 SHA-1: cc717b09008bbc26a949327e7d67e0a3c3f816e1 SHA-256: a57707d5818e9c5c3a9c0ca015c4b2aabd5120c1af856f23846f9bd8b457e548
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=7.2+periodic+table+quiz+answer+key PDF link annotation
    • https://gifezimudafero.weebly.com/uploads/1/3/4/3/134312010/watalopu.pdfIn PDF document text
    • http://com-signto5.xyz/forefswwv5.pdfIn PDF document text
    • http://alkostore.xyz/death_s_gambit_fink_questions_and_answers6j8zl.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/xarivolzwlx.pdfIn PDF document text
    • https://bewimowijukoja.weebly.com/uploads/1/3/4/5/134584545/1168582.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/pjcY8ID/19989490463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501965/normal_601ed9b7cf701.pdfIn PDF document text
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/besigasefow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423145/normal_5fce23501723c.pdfIn PDF document text
    • http://getcabinets.xyz/pioneer_fh-x720bt_installation_manual2qgb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_600f91d96d0b4.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/geWhcrD/45410818225.pdfIn PDF document text
    • http://milano-moda.space/17140281900o2hlm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_8d66d5b2adda4b50a48d552ca58f5b0f.pdf?index=trueIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_fb2f7c3add3540fc84b6a791f5c1af80.pdf?index=trueIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_67d07ccdcd254d90a0250f3b6681643f.pdf?index=trueIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_fc4daba66edd4e6c91535ba103057124.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/abf851ad-6f06-415c-97d7-b36e0529c78f/baludiwozana.pdfIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_38c4a826338542e9846659cac141fd4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef6828a-ec57-4880-b7ca-cc7e0d7a4d34/96191122214.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_off0000ebd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 5788 bytes
SHA-256: 09314f4c3fe7c37a97f12ca31d8086ec12a1bbaa91bc1eb0716d1dca181498ad
font_01_sfnt_off0000ffbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBD 10504 bytes
SHA-256: b3a31ad34be5a94aec28340a41286c364a23f42764bde22a4b92b2e45940f01f

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