Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d8cce5c5d91914…

MALICIOUS

PDF

93.6 KB Created: 2021-03-14 09:37:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6eb4fad8fe6f4286f0701912d4ff798d SHA-1: a943476166e29b74f04014660ff2805fa4c14ca1 SHA-256: 17d8cce5c5d9191447e9214f481c8b129e57f39978de8a4b7b85f19c3272403f
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though corrupted, appears to reference a service manual, likely a lure to direct users to malicious URLs such as fokemale.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://fokemale.ru/strik?utm_term=rinnai+556ftr+service+manual PDF link annotation
    • https://mogeletonedilo.weebly.com/uploads/1/3/1/4/131482944/f5586645c12b.pdfIn PDF document text
    • https://neveloso.weebly.com/uploads/1/3/1/4/131408616/e915b073de.pdfIn PDF document text
    • https://pekonupag.weebly.com/uploads/1/3/2/7/132741447/c423a.pdfIn PDF document text
    • https://pevapulef.weebly.com/uploads/1/3/5/9/135979240/d38fab8560443.pdfIn PDF document text
    • http://ruszaimclub.ru/boss_dr_synth_330monty.pdfIn PDF document text
    • http://bikokobolo.sportsontheweb.net/98742662486.pdfIn PDF document text
    • http://tarezirok.mypressonline.com/derojafebelew.pdfIn PDF document text
    • http://aazzzry.space/sixumibatikawujizupk4xjo.pdfIn PDF document text
    • https://remoruputudedux.weebly.com/uploads/1/3/4/0/134017090/1354769.pdfIn PDF document text
    • http://eroganoficial.site/exercises_can_stretch_your_plantar_fascia4jdze.pdfIn PDF document text
    • https://radunepik.weebly.com/uploads/1/3/4/6/134617153/xifowol-tosepo-luferoxele.pdfIn PDF document text
    • https://baxorejo.weebly.com/uploads/1/3/5/2/135295822/jamemugofiwevalan.pdfIn PDF document text
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/8514865.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/0d04fd43-43ab-4bec-be60-e5116c36458f/after_we_fell_book_synopsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c7f48b-4cb0-42d8-ae79-79fd4af467d4/reset_toner_cartridge_brother_mfc-7420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ae946d6-5255-4681-9ff2-d2326ad562ea/amc_8_2019_practice_test.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/particle_physics_jobs_rumor_mill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/497214cc-314a-40b3-b0c8-38d5804dd8a8/how_do_you_reset_your_voicemail_password_for_verizon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48e2aa4-ced7-487f-b935-cc8edc334727/sound_blaster_z_pcie_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/epson_wf-2540_manual_en_espaol.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F94 5372 bytes
SHA-256: 67a2d5efc12105dc4af490bdc6358f971a5a63bc1521e345f5cbd39ea7633944
font_01_sfnt_off000141dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DD 11984 bytes
SHA-256: bc254d650763c2b87f89b1b941a5b1903725649eb5a53692c485a02d0a3383ef