Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4796e40afd3d3fb…

MALICIOUS

PDF

91.0 KB Created: 2021-03-26 09:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e2fb7e4bc577377c5d518b051f702971 SHA-1: 5fd45abc13431e77266ccd15c39ec4a01650282e SHA-256: f4796e40afd3d3fb2af0279f686968c8eea99dc8edf95da06b1af86975ab9467
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://lozipotod.ru/123?utm_term=b.+el.+ed+form+2018 PDF link annotation
    • https://cdn.sqhk.co/wevemugas/cddg6Vo/44877622084.pdfIn PDF document text
    • http://wejuveziwep.mypressonline.com/seth_lakeman_net_worth.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/bumaxuxuxokiromemij.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/hojijhj/island_of_adventure_orlando_park_hours.pdfIn PDF document text
    • https://dokegofixak.weebly.com/uploads/1/3/0/8/130873830/4743904.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/ezNKie8/flow_free_download_windows_10.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/how_to_tell_if_wood_stove_is_epa_certified.pdfIn PDF document text
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/satame_litegakupip.pdfIn PDF document text
    • https://luwozupewudaxu.weebly.com/uploads/1/3/1/3/131384663/dojopexepi.pdfIn PDF document text
    • https://pomapufawupufus.weebly.com/uploads/1/3/5/3/135397804/1504579.pdfIn PDF document text
    • https://nibobesexetew.weebly.com/uploads/1/3/4/2/134266191/49c0ada.pdfIn PDF document text
    • https://tetusujofejami.weebly.com/uploads/1/3/2/6/132695476/xawedatuw_kupedevuku.pdfIn PDF document text
    • https://juvujifakodokiw.weebly.com/uploads/1/3/4/6/134699996/5320282.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_8fabef806deb42d680236133dbecc8a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e2a483-fc40-4e80-92dd-e08c6b9f4a3c/teaching_methods_and_strategies_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8908b37-9102-4cd4-b32c-0dc90f55f0e6/best_psychology_books_on_human_behavior_in_hindi.pdfIn PDF document text
    • https://87098103-4d08-48bb-90a6-807b0ef734b2.filesusr.com/ugd/1f49de_13ca7e011925432f875ed3c012d6bf33.pdf?index=trueIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_0ae15bd2217e40289eb2ffd7f249f186.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4472cf9b-e276-4a0a-a202-f88a8f603e16/coleman_portable_gas_grill_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0580b16d-2e4c-464c-abfa-288ca324405e/28120184632.pdfIn PDF document text
    • http://bolirazebaf.myartsonline.com/manual_de_pioneer_avh-270bt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d01f57-1fab-42f3-a944-9cc2473515dc/why_isnt_my_brother_sewing_machine_working.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_off0001191e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191E 4820 bytes
SHA-256: f6550cd7b7d8d905c9d65a9ce16c36cbc1b6f1f17bdaa9d43220c2d81d82bd4e
font_01_sfnt_off0001297d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297D 11036 bytes
SHA-256: e64b079f6fbac609c3feb6ac8fb263f3f6b433b3784998c063243f96a75b4ee9
font_02_sfnt_off00014f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F15 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34