Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37080397b1f2d2b…

MALICIOUS

PDF

92.6 KB Created: 2021-02-18 03:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 0c0d04e5e90ffb316fc6654cf550a403 SHA-1: 838bf85e81333b507424a92dc0567bd5de61d21c SHA-256: e37080397b1f2d2bf38bd9c01b661616c4131b9060bf24e20fcb80dcadc11833
184 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, with at least one identified as a known malicious redirector. The PDF structure and embedded links suggest an attempt to lure users to malicious websites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=mo+gawdat+solve+for+happy+summary In PDF document text
    • http://ketrovk.xyz/giving_directions_free_printable_worksheetsm65pe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484623/normal_5fde7567b4c95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405208/normal_5ff3b7c0b6eb1.pdfIn PDF document text
    • https://lojavexir.weebly.com/uploads/1/3/5/9/135963097/gabinanowudit.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/8463343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_601af1ef3fe8e.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/DjciQhe/nuzarapoboxus.pdfIn PDF document text
    • http://crispyset.online/warrenville_city_jobsuvlzo.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/NibLyhi/nasa_vector_logo_history.pdfIn PDF document text
    • http://blacklaser.ru/yowhatsapp_mod_ios0gezx.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/hcZXCzz/stack_it_up_lyrics_flame.pdfIn PDF document text
    • http://samelike.site/audio_cutting_software_freezkm3i.pdfIn PDF document text
    • http://kellys.space/levedakonugapadexc7xj.pdfIn PDF document text
    • http://mushygushysayings.com/43694418738cqb70.pdfIn PDF document text
    • https://jaxizunup.weebly.com/uploads/1/3/4/8/134885867/kokuzuru-marulefineb-banizima-jixabes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/masevewi/36295208385.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/24751929821.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/aarya_telugu_movie_audio_songs.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_off00012c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C62 5712 bytes
SHA-256: fd0049c97beadac61a9ba3cd073ea97decdf147c96f3283a9ecd4eb2baa90c23
font_01_sfnt_off00013fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD8 10944 bytes
SHA-256: 3d2a041921baf4f9ab88ca52722c319a9f8d03c682c8f5af08e575250ade0bef

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