Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce3a647091a5c52…

MALICIOUS

PDF

82.7 KB Created: 2021-03-04 19:01:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8ab06b20f27c7d58d1d292a2659c3acb SHA-1: 7bc895c4caee1a3e340ce832ae3f19c652b74614 SHA-256: 8ce3a647091a5c52173cb0d235d3fc78130dc03b8211c1fb340633f2198e9781
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. The embedded URLs, such as 'https://midufefew.ru/123?utm_term=where+to+learn+calligraphy+in+singapore', are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/123?utm_term=where+to+learn+calligraphy+in+singapore PDF link annotation
    • http://kismyketio.com/23528243401k90f8.pdfIn PDF document text
    • http://summer-italy.fun/australian_drinking_water_guidelines_summaryrrscu.pdfIn PDF document text
    • http://batmbatm.ru/72017844983oiagv.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/5f28dd47-d6a8-4a08-8e6e-89f22b8318f2/best_monday_night_bars_in_atlanta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f8ebae-7a83-4ae7-a554-675273daae60/32194000543.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_ab73f92b3bc645ec96a0e7b18bb51565.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5bd6d85-caeb-4297-9c02-0a6afb7cb7be/66678901728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93656db8-3de0-4f14-a639-36d09a5bb3ee/what_are_the_reiki_symbols.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cee1eac7-9e98-406d-9e7a-a73e793655d1/how_to_treat_pimples_on_my_scalp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c85ddca5-2e93-4068-9e5a-86248858da0c/how_to_bypass_printer_low_ink_canon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7548526b-2979-490d-a8df-f4ac38714145/how_to_make_ground_deer_jerky_in_a_dehydrator.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_79270ee237534a5db2bede875b0321e2.pdf?index=trueIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_b42df292751045e68af8ba17d31e135a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ba07df-1e65-4e89-bb07-36ca530c7f84/is_college_algebra_harder_than_contemporary_math.pdfIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_97b12063c927425ab2fd9ddffa731dbd.pdf?index=trueIn PDF document text
    • https://ebf315e8-bd2d-4370-9039-911b8658b70a.filesusr.com/ugd/451461_378e36b08cab4fbc8a18c463643b4099.pdf?index=trueIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_99010dfbe01f489a8108e75e2ac9fa05.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f84370ae-ed41-4a37-b969-6f8aff48d86d/3525992803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0503ced-42ab-46c1-a656-8dfe17852723/2484742622.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_743f9b956495444397e966e327520135.pdf?index=trueIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_36e984b6012c4950a63a2a8b449c66a4.pdf?index=trueIn 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_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 5308 bytes
SHA-256: 6ffedd58529900f407a3115949fdd6bbd7750a1b1e519ece30ef7806a52af9e4
font_01_sfnt_off00011701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11701 11260 bytes
SHA-256: 17503f240a4b7fc020998271c91fe6d729035470ee9840c86c4f49ee57be6a36

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