Malicious PDF — malware analysis report

Static analysis result for SHA-256 6327852eec2dbf9b…

MALICIOUS

PDF

87.6 KB Created: 2021-05-20 21:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 051439aef24792e97a2b7f01f622831b SHA-1: ce55ea1c8b980855b5b68a0b2b9a9249e352cbe5 SHA-256: 6327852eec2dbf9bfdc85cdd4efa46ef6e4935d7bb6718320b12356b7d8ba07d
156 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 pointing to other PDF documents, which is indicative of a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of numerous external links suggests an attempt to redirect users to potentially harmful content.

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://mibujisoj.weebly.com/uploads/1/3/4/5/134525757/565794.pdf In PDF document text
    • https://fenanenu.weebly.com/uploads/1/3/4/2/134265689/nilokopafaxux-xipodetazu-pefigo.pdfIn PDF document text
    • https://xobojurum.weebly.com/uploads/1/3/4/5/134599739/4574029.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/KjdSuPfhPRY/wb?keyword=fishman%20loudbox%20mini%20amp%20coverPDF link annotation
    • https://uploads.strikinglycdn.com/files/1dc395ef-bb92-4217-a7ed-34f9dfbadab7/how_to_prepare_top_bar_hive_for_winter.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/safuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9e04bc9-7972-44a9-a7c0-c6f4a3f4dcdd/how_to_put_paper_in_a_hp_officejet_pro_8610.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/8575114648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61497862-1dc7-4a06-9fff-e4b5cf80b51a/81518774333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05dfa0ea-55cb-40c4-9d07-b959cce31c7a/yoga_mudras_and_meanings_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ed13246-1e17-49a4-9761-03b53c06e2bc/smoothie_recipes_without_yogurt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/040a0448-9da1-4819-8d5d-73ae4e311f19/toro_leaf_blower_vacuum_review.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/92732413132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb7367b-16d5-412b-845e-adef09e255f1/wetorebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0795d898-6a2e-4db6-afdf-f3a60427dd7f/how_to_tell_if_you_have_a_cyst_or_boil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/749484d1-25ad-4240-ba19-045b6e805335/28353415662.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/tuzokugata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/471a64fe-2a79-43d8-82bd-f6651c638d31/dometic_9100_power_awning_operating_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e60740-c9a6-468c-a30c-b83bb4301b79/52829434748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12aa6609-d007-4d59-ba3a-7f701e44b8d0/gumalugagusibipepaluku.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/synoptic_weather_map_worksheet.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_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 11636 bytes
SHA-256: 9a327d2d01d03df4119fb5524dfe82bc71dd54b85bbada8d1a06521aafac23d0
font_01_sfnt_off00011515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 5536 bytes
SHA-256: 73ecea22587ec34c7c16cb28e957f7d2ca6256d3d11691080cac7bc4db618204
font_02_sfnt_off000127bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BB 11792 bytes
SHA-256: 58cef34fd601100cb13927ced1de52f87b749c2f18d358cdf7b057c38c54d30d

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