Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28ed0d3860af410…

MALICIOUS

PDF

77.3 KB Created: 2021-05-29 06:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5590a0932170a19b1f6629bb66db80b4 SHA-1: 74b2b2946ad09418acab3bcef0911a8a0aa5bbcd SHA-256: d28ed0d3860af410a8a2ab0724c0ec25f3fe17032994ed6f82a453f6f37467d1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://xajibur.ru/strik?utm_term=affidavit+form+pdf+michigan+election PDF link annotation
    • https://rupunapu.weebly.com/uploads/1/3/4/3/134354814/49351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_604513b428d0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409254/normal_6069e40250408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484805/normal_605fe4d1009d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460461/normal_5fc7e835397d1.pdfIn PDF document text
    • https://xilivixawigilu.weebly.com/uploads/1/3/4/6/134672458/reweliwofojogabe.pdfIn PDF document text
    • https://lemorixumo.weebly.com/uploads/1/3/4/7/134748879/7209997.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387430/normal_5ff65cd3515f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416304/normal_5ff6041f442c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403415/normal_605e1baf8b874.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495058/normal_5ffdefe9d2fda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486034/normal_5ff9f9608e7f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449616/normal_60009eb7ad405.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0bf387-b220-49e5-9dcc-1dc992856fe5/wajib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19eae20a-cf56-4f1a-8f38-96ef6b0e6068/all_good_in_spanish_slang.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975a7eb0-5c5a-470a-b888-16de11ea00e9/how_to_play_need_for_speed_underground_on_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8808849c-dcef-4fe6-a285-b8d54f23391b/ar15_stripped_upper_receiver_no_forward_assist_-_fde_cerakote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c8ec6cb-80b9-487e-83f4-508ed219daf6/sword_art_online_progressive_light_novel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe539594-b913-439b-bdb0-2ffa5be36f1f/szck_dzeyinde_anlatm_bozukluklar_tyt.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_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 5440 bytes
SHA-256: f28dc1f98f1e038ec23f3665013ebc86a61a34f3b28af627478f73a0073803a6
font_01_sfnt_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 11160 bytes
SHA-256: 0caca6039898e7f34fae11cc86a3b1de9d02a2e58e3317153378cef12201a1ff

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