Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8239eb56e9a8029…

MALICIOUS

PDF

80.4 KB Created: 2021-01-06 06:11:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f5348f16b498ce6e4d67fce06f640ec2 SHA-1: 5e9cdd5a3e92ecaec369adede7fd5fa68038397b SHA-256: a8239eb56e9a80291a6e9c42055ed27a13c0025f12b965f4c8aa55b80513f786
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a large number of external links, suggesting a link farm or SEO manipulation. One of the embedded URLs, https://traffset.ru/123?utm_term=life+cycle+of+a+jellyfish, is suspicious. ClamAV detection as 'Pdf.Phishing.Trojan' further indicates malicious intent. The document body, though partially corrupted, contains text related to 'Life cycle of a jellyfish' and authoring information, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=life+cycle+of+a+jellyfish PDF link annotation
    • https://zoropafe.weebly.com/uploads/1/3/4/3/134374448/91dd586.pdfIn PDF document text
    • https://cdn.sqhk.co/pofifarim/3Wjha5e/ipad_assistive_touch_home_button_not_working.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/520dd.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/iihjdhj/time_traveler_s_wife_ending_scene.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_5fb46759454df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499299/normal_5fdd29cdf087d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/fedixutudasib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a08d734-72d2-4d3f-9e8c-1e4656a40cbc/john_kanaka_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cebef172-8b83-4f43-8165-16622a8997e7/kizod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4f27186-b215-4977-9422-b4f7557f31e3/honeywell_proseries_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6db50055-0fd1-459e-8696-9cb7f0f52710/malup.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/history_of_video_games_book.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/astrologian_guide_4._4.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/8357460417.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 4596 bytes
SHA-256: 8fc528524304e257b5b1a959dcf523b895d79bb527943df1e53061eebbd75ced
font_01_sfnt_off000102e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 10568 bytes
SHA-256: 6dbf8830afcb23a7e1bb6f9aa1cf12cc047877446bac2e5080e6d80eb2772ea1
font_02_sfnt_off00012691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12691 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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