Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5e51d795ee76c7…

MALICIOUS

PDF

72.6 KB Created: 2021-03-28 04:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7477d075d10cbf5b92bd6d03ba51af19 SHA-1: ed5f9c6bbc1ec50f535a909357198ab7c7582d8c SHA-256: de5e51d795ee76c79ec851448eb02803a00ef60018f0d0d5653857fe14fb8e60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which are to potentially malicious domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to exploit users into downloading further payloads. The presence of a 'download button' heuristic further supports this phishing-like lure.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/123?utm_term=airbus+a320+p3d+v4 PDF link annotation
    • https://cdn.sqhk.co/fuwufupi/ghLeja7/fruit_splash_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/ggBhhjj/my_android_phone_won_t_update_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/aohjcjj/iphone_text_messages_not_appearing_on_ipad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494430/normal_600a3bb834feb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389805/normal_5ff0cf6bdac41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368782/normal_6004690672225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_5feaf05f06e44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/3304573210.pdfIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_90cd4de61a9a4d459a421af6dac73c96.pdf?index=trueIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_f104579bb1dc454f9f7ebdaf9e0c9da7.pdf?index=trueIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_e2ab64fba5f641d3ad36b550d0e1a921.pdf?index=trueIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_fbb359341b354cf1988ea73fb870150a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zunaporam/munejavedimafagelenar.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/leave_approval_letter_from_employer_format.pdfIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_176607930f4f45cfae0895dfcf49d661.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daxemo/paradigma_sehat_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/suwupuzixijokedoda.pdfIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_a4cd2fd56bd241cf8b02b6d9b4ecdca6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zizene/what_works_on_wall_street.pdfIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_b85ec99d8ab5463290e5163007855373.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_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 5636 bytes
SHA-256: d09db3dc23ea2286779fc43fe9ae81a55e1d9552830a4975be0cb28f348fe559
font_01_sfnt_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 10768 bytes
SHA-256: b7f3f248c8e9d9be14d8a5029fe8be70e27149d7c695bb4a1e1579a1cd5ca8b9

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