Malicious PDF — malware analysis report

Static analysis result for SHA-256 753ef23c2d03cd61…

MALICIOUS

PDF

79.5 KB Created: 2021-05-31 23:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6834684f377aae6a72490513f5d62a0 SHA-1: 7c6c0a03c00a4ed8537bf85703634ca78e0ab9bb SHA-256: 753ef23c2d03cd61020a269965aab906985021fa544da85a1b70d14b905c9e49
156 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and a heuristic firing for a 'PDF_SEO_LINK_FARM' indicating a large number of external links, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the document is designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/pbw?utm_term=viper+1000+alarm+wiring+diagram
    • https://xubebivox.weebly.com/uploads/1/3/5/3/135392957/negotuz.pdf
    • https://static.s123-cdn-static.com/uploads/4454825/normal_60087f48a9a6e.pdf
    • https://static.s123-cdn-static.com/uploads/4416787/normal_600079c371aaf.pdf
    • https://wufunuxiropid.weebly.com/uploads/1/3/2/7/132712508/3095827.pdf
    • https://cdn-cms.f-static.net/uploads/4484993/normal_600e74cfa1af7.pdf
    • https://static.s123-cdn-static.com/uploads/4458829/normal_5ff37d70b9a1d.pdf
    • https://fukobararusi.weebly.com/uploads/1/3/4/4/134404541/7072159.pdf
    • https://mabexerezigija.weebly.com/uploads/1/3/5/3/135324341/ba3c5012af020.pdf
    • https://fulapelaz.weebly.com/uploads/1/3/5/9/135970028/8426543.pdf
    • https://cdn-cms.f-static.net/uploads/4445114/normal_5fe6c64452411.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/54a10254-7a44-426c-827c-f93defd31dec/53687349081.pdf
    • https://uploads.strikinglycdn.com/files/7f57a1cf-50a6-400f-bc04-77c4ca09928d/how_to_practice_ashtanga_yoga_at_home.pdf
    • https://uploads.strikinglycdn.com/files/d4bba6de-9142-4c92-a5b9-ae83543bdad4/fibalugu.pdf
    • https://uploads.strikinglycdn.com/files/ef7d99f3-50a7-4be9-aeb6-9ec3dc4e05b0/how_to_reset_bluetooth_on_pioneer_avh-270bt.pdf
    • https://uploads.strikinglycdn.com/files/4fc56bcd-c4b6-4dc4-8d90-3e7460efb59b/bissell_big_green_professional_carpet_cleaner_machine_86t3_rental.pdf
    • https://uploads.strikinglycdn.com/files/a064b25d-8319-4ece-8f3b-1cd211ae0825/how_to_draw_a_dragon_beginners.pdf
    • https://uploads.strikinglycdn.com/files/e7f41f73-6a4a-46aa-8d6e-a81e857359f9/dapamuzevigoko.pdf
    • https://uploads.strikinglycdn.com/files/77421034-a26d-4947-9e4b-ffdcb06f4d8d/how_to_level_samsung_vrt_plus_washer.pdf
    • https://uploads.strikinglycdn.com/files/53bfdb2f-9cb9-402e-8ed0-dd35ee71eba9/motorola_whisper_mic.pdf
    • https://uploads.strikinglycdn.com/files/e7908798-8ec2-4b8e-8563-f355821f5288/jikowukopiroxefipusefoxif.pdf
    • https://uploads.strikinglycdn.com/files/bb4fc007-5f01-4a7f-bfe0-4493ea6cd976/91333353014.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed47.bin
7942226428afb8319e8a0136022f97e1ceacd4c5f98488f2bb8705d44ab29184		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 4952 bytes
font_01_sfnt_off0000fe06.bin
3268b069f0c4f0900e440bcd2a98c6ae2619f7db92c30b4753035ff7f38f3ce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 10184 bytes
font_02_sfnt_off000120ba.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120BA 4324 bytes

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