Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aac511ea32e9a2e…

MALICIOUS

PDF

76.2 KB Created: 2021-05-16 08:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ae58d8c1d348daf169053fb4ab61ee8a SHA-1: df9452ebc5cab627476c252e21f9c00a52e49299 SHA-256: 8aac511ea32e9a2e3132021f7a4039d7954820ffee768a4ed346c46bfadf76d2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://lozipotod.ru/strik?utm_term=can+you+fall+in+love+in+long+distance+relationship PDF link annotation
    • https://satiwumufov.weebly.com/uploads/1/3/4/7/134724604/sixawapanozemim.pdfIn PDF document text
    • https://fixizogi.weebly.com/uploads/1/3/5/9/135959929/cd4b7a.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/best_classes_diablo_3_season_22.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/3834054.pdfIn PDF document text
    • http://nizixoj.iblogger.org/11332810339.pdfIn PDF document text
    • http://connexion-amelii.xyz/cad_2010_keygen_freeoouq6.pdfIn PDF document text
    • http://kersita.fun/936968206080mbva.pdfIn PDF document text
    • http://nekazupafo.mygamesonline.org/zobexulowamexefowafa.pdfIn PDF document text
    • http://reduslimitaly-official.site/brastachara_in_kannada_informationyinho.pdfIn PDF document text
    • http://3203epworthcres.com/management_information_system_practical_examplesnw1so.pdfIn PDF document text
    • https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/f89e98761a.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/c1d3a6d0-4c48-4f31-962f-50af3676157b/26454782934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46dd66a7-0240-4856-8d19-7fb7ebf95b30/1197901224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26acf65d-1fd1-49a8-9303-eb174c855cd7/9246671469.pdfIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_e92f4c79acd442dfa1cfc5a1180f07ca.pdf?index=trueIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_8a7144b375f240f987b24318d91727f8.pdf?index=trueIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_c30e5d176092473eb891f7fd0b652175.pdf?index=trueIn PDF document text
    • http://foweroboxufafuv.epizy.com/gemuzanifilizosarila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bacaa48f-af9c-4a86-9b59-3e4f1009d53c/data_mining_meaning_in_computer_science.pdfIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_bf78bfcb2cbc4249b0fe16c41444b490.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_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 5484 bytes
SHA-256: 2dbaeff61c8c61ddf1d0047b8c245add737848a5937ed1d69826b35b06e1a7f0
font_01_sfnt_off0000faf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 11332 bytes
SHA-256: 3b1162333493721b1f993be31ba1fd0917a3f05a7c281783ab0a4a8fcfa6f0c7

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