Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6b0b2279f2fd4b…

MALICIOUS

PDF

80.5 KB Created: 2021-03-22 18:23:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8d0320338e47d2f60ee03b289d0d906 SHA-1: 216999fdff759a2f9ead7f1365767f8b297d3ddb SHA-256: bc6b0b2279f2fd4bb4d002126a265b7cfc978fcc1341716fd9b2948e04dfcd04
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on link farm services, indicating a phishing or SEO poisoning tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

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://nipisod.ru/strik?utm_term=how+to+print+from+iphone+to+hp+deskjet+2600
    • https://tizirabavapamob.weebly.com/uploads/1/3/1/4/131453045/lebepadotolapi.pdf
    • https://static.s123-cdn-static.com/uploads/4467577/normal_5fc714a3971bb.pdf
    • https://static.s123-cdn-static.com/uploads/4373261/normal_5fef6334a6bfd.pdf
    • http://uabiomanix.xyz/cardinal_and_ordinal_numbers_english_worksheetbethc.pdf
    • https://nurivotewifigex.weebly.com/uploads/1/3/1/1/131163684/nifunuvijugudokofe.pdf
    • https://paruralevefux.weebly.com/uploads/1/3/0/7/130775474/netefanemegijas_xirulitif_vuxevizukuluwes_femudibenot.pdf
    • https://static.s123-cdn-static.com/uploads/4368494/normal_60042ff2ba809.pdf
    • http://dombitarf.ru/senior_android_developer_salary_in_canadakbbbp.pdf
    • https://cdn.sqhk.co/libobivole/gcBuggR/kunowekaka.pdf
    • https://static.s123-cdn-static.com/uploads/4485450/normal_5ff0972e7c891.pdf
    • https://cdn.sqhk.co/zunesunatiri/c3jbDFk/clash_of_clans_june_2019_update_leaks.pdf
    • https://cdn.sqhk.co/lisakopew/KhemhfG/ice_machine_for_knee_replacement_surgery.pdf
    • https://static.s123-cdn-static.com/uploads/4462037/normal_5ffe174ba795c.pdf
    • https://static.s123-cdn-static.com/uploads/4471995/normal_5fff6a9eb2efa.pdf
    • https://sukorason.weebly.com/uploads/1/3/4/5/134578332/e3071e.pdf
    • https://cdn.sqhk.co/lozuzupadis/fjhighi/60558633045.pdf
    • https://cdn.sqhk.co/gofelaxes/cheIpif/starz_on_hulu_list.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8141b9e6-fbbd-4b8e-ae31-39fe7f4ca8af/how_to_maintain_a_dyson_vacuum_cleaner.pdf
    • https://uploads.strikinglycdn.com/files/0a8a37a4-332f-470e-933e-3e1f891394d3/whirlpool_refrigerator_ice_dispenser_not_working.pdf
    • https://uploads.strikinglycdn.com/files/e536817c-e2ba-4b5a-84ec-214a5e3fcea5/kagijumalumelikilesexo.pdf
    • https://uploads.strikinglycdn.com/files/48e443ab-6c1f-4239-95c5-9728a217c85d/vabebitetefovikivalebogiw.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_off0000efc4.bin
b6cce915df5982742652ff28af0515eaef72f37731018472d054b7b55fbb6fb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 5448 bytes
font_01_sfnt_off00010231.bin
4f9b0deb414832b740a7da477552cd5548c4c2ccda7a4b41269e9e488db43eb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 10000 bytes
font_02_sfnt_off0001246e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1246E 4324 bytes

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