Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd65cab7fd64f3c7…

MALICIOUS

PDF

77.4 KB Created: 2021-03-16 00:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a0fdceb5cecc0cf29b4e09e18f465f0 SHA-1: 374d58e2a6b6a413faac351b1870cd1ae48a1f2f SHA-256: bd65cab7fd64f3c746c1e7d5a217ef6427a513248fe38299c67c84b16667f31f
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a significant portion hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=ying+chen+md
    • https://cdn.sqhk.co/girewobo/WS2TeTV/i_ll_touch_base_with_you.pdf
    • http://fusekimutoxi.sportsontheweb.net/youth_mental_health_first_aid.pdf
    • https://cdn.sqhk.co/kopilixa/DheheQT/90616279983.pdf
    • https://cdn.sqhk.co/gabebutiz/jaihmji/home_furniture_assembly_services.pdf
    • http://dupuladusudired.mypressonline.com/36820973256.pdf
    • https://cdn.sqhk.co/fuluzagile/iehghKw/6235111930.pdf
    • http://finuxezanasa.mygamesonline.org/design_of_concrete_structures_by_nilson_darwin_and_dolan.pdf
    • https://cdn.sqhk.co/dasisogi/ghieuTQ/furious_payback_racing_unlimited_money_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_08fbb2fb71de460f89861592041374e5.pdf?index=true
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_68dbca1e12c945e0a425b8a37bca6844.pdf?index=true
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_ab4dea03c2cc4e4aab41135d72d40bd0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e55b3560-3089-4b79-aad9-78b977c65a39/mumunokovokajadewilo.pdf
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_f17b127e54c24868bbae140a01053cd0.pdf?index=true
    • https://79ab8074-8148-4faa-9219-f6cdfa35bc15.filesusr.com/ugd/99e004_6c38fb3c571a4319b9063fb16fb3a21e.pdf?index=true
    • http://saboveliga.myartsonline.com/16545014770.pdf
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_c0cab8c6effe49bcab67102797283e04.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6fbd1b6e-e64e-4280-b394-2e557c7ada20/lokeduzatudozusi.pdf
    • https://uploads.strikinglycdn.com/files/9659e70f-8233-4aa6-aeb0-76f9557ef04f/pals_menu_rogersville_tn.pdf
    • https://uploads.strikinglycdn.com/files/6089b6f9-b329-48a0-b006-a8c68d4d0b56/manogededozunanivas.pdf
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_0e1b83bb70854365b3844a9e66d8a376.pdf?index=true
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_0552df2c51de49bfa942bb873853e144.pdf?index=true
    • https://99ca13e2-8bf0-45b2-93fa-bbfb519f101f.filesusr.com/ugd/5392be_2c5c0240ac9544fdaccfc42b1dabbdc8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/50eb9ef4-3089-46db-83a0-345624d9ed70/printable_calendar_2020_with_holidays.pdf
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_254376ad61e64d0db8449d539d72455e.pdf?index=true
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_06c0f7078e174532803835afdaa84274.pdf?index=true
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_3a56d525d1f14d8cbb0581eb0590762c.pdf?index=true
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_1ef0736794d94b6ab1407acfa7ea8c18.pdf?index=true
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_3a98876dbf9643dc9df2b059101b5935.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f329.bin
b835c871770f6a83c7c0d4f17a0f8068db1db66aae6c905ce4e638b9c9ad7435		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 4796 bytes
font_01_sfnt_off0001035a.bin
ab205b4198a5696b3e73c8e146babb39c0321a320ebd9c09355b744cda7de3e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035A 11096 bytes

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