Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf6642d265e061c…

MALICIOUS

PDF

75.6 KB Created: 2021-03-23 04:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6b5ac4a76080321df24d2b4aa95e5c5a SHA-1: d32e9e24421752d682d7545d95d4a161b72f0d72 SHA-256: cbf6642d265e061cbfcb7c940ee520b69756437962b02f096886547bdf5d0567
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to disposable hosting and are likely part of a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was programmatically generated, likely to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/wix?keyword=connected+mathematics+3+shapes+and+designs+answer+key PDF link annotation
    • http://pofaduxiruk.getenjoyment.net/34004101348.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/29465691184.pdfIn PDF document text
    • http://lozomaneje.getenjoyment.net/why_is_my_comcast_router_blinking_green.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/royal_mail_address_format_standards.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2abb6bf-af35-4977-90e5-a1e21d5e29e1/dinolutul.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/how_to_connect_rca_voyager_tablet_to_tv.pdfIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_86391aecc0f04efd9cd2f13a1c236f5c.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_f5eee375c3a045ccb97e422f554e815e.pdf?index=trueIn PDF document text
    • https://16fd32d6-95e0-4b29-89ad-7162b4f2ffbe.filesusr.com/ugd/9f4b57_218d8fe19d57481b81884ef88db0cffd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58038e57-6aee-4908-b3a6-7bc46eb6c8e9/3217524455.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_ca700b6b1357423ea61fb1432dce8191.pdf?index=trueIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_f9b875add43b4d6b9253fba579ff04c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/what_do_you_do_when_your_heater_wont_turn_on.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_46cb8b423e6d4f7dafc112586d378e1f.pdf?index=trueIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_1fdb3037bec24d8ba23023a8fe8d49b3.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_4836ef3301c645789a16700bdd197a71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/054c04e0-4a6f-4ddf-a28c-80f85311d31d/86892100252.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_f4eeeda1237b43e09cabde72f67d748e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8520ac0-c247-47f6-b8f7-6631a06dffb1/99927421226.pdfIn PDF document text
    • https://291e86d0-b4b7-455e-aeca-30cd05102b29.filesusr.com/ugd/384a46_b0d50581cb8f4414b64e556816c00d8e.pdf?index=trueIn PDF document text
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_8a3cc0be277b4e10b72d6435bb2dd10a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe3d434-1e2f-40d3-8834-1b73a2d49330/the_magician_tarot_love_yes_or_no.pdfIn PDF document text
    • http://zijedan.atwebpages.com/best_commercial_grade_waffle_maker.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18D 5784 bytes
SHA-256: d83f05c3efb34be12988fe788ffb2d5c25a0f7fce8ea8fd3a3403ed78a321f83
font_01_sfnt_off0000e519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 7760 bytes
SHA-256: aa817f452f26acdb26481491ba937641dda59543120fe350b67cf708b112c7eb
font_02_sfnt_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 10440 bytes
SHA-256: a636d660394106e6cdb37793d0bc8fa6614fc69cbb9af1f19d65788eeaa56f79

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