Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4222f911d8a9c6c…

MALICIOUS

PDF

79.5 KB Created: 2021-03-20 02:23:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7c02044e1c776cb5d872673eea276071 SHA-1: ac3d8db77519701c9bd39e3b8e6be62e9b1729de SHA-256: c4222f911d8a9c6ccfa1a866d558c9329c5f7521f93488691f1e265ee5402a4f
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 0.9998

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://gimoguvi.ru/wix?keyword=aigis+social+link+start PDF link annotation
    • https://cdn.sqhk.co/lolatonuvesa/ztchjjf/weather_liverpool_ny_hourly.pdfIn PDF document text
    • http://fc-aromat.ru/you_re_insane_bird_memewk2n3.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/subusuresifo.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/giUhhit/datiwetuwo.pdfIn PDF document text
    • http://vkrowl.com/bafatufccqi.pdfIn PDF document text
    • http://prostotit.site/lv13k.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/fgghbhg/makenumilarakufafuf.pdfIn PDF document text
    • http://cz-nitrof.website/neato_botvac_d_series_clean_brush45ppy.pdfIn PDF document text
    • https://vibakifekapob.weebly.com/uploads/1/3/1/3/131398015/358c24bb.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/enjiqgj/kefuloluzigexuxiveno.pdfIn PDF document text
    • https://zaxixeresez.weebly.com/uploads/1/3/1/8/131871416/rafokogazosovadeg.pdfIn PDF document text
    • https://fatatovol.weebly.com/uploads/1/3/4/7/134707957/rojuzafona.pdfIn PDF document text
    • https://nimugafibe.weebly.com/uploads/1/3/6/0/136084612/vitazaf.pdfIn PDF document text
    • https://nutotawi.weebly.com/uploads/1/3/0/8/130813366/6540429.pdfIn PDF document text
    • https://powumebaporisav.weebly.com/uploads/1/3/4/8/134891471/poguzamuvomup.pdfIn PDF document text
    • https://cdn.sqhk.co/fetumamuv/7oZtjfI/balls_bricks_breaker_2_hack_apk.pdfIn PDF document text
    • https://kuxozofaxaxasij.weebly.com/uploads/1/3/5/3/135325708/tidamatoxo-guxozer-sokogopewazok.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/a7b93416-67bf-4df2-827f-ecea4934990f/misspent_youth_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/446d735e-2673-4e85-aee3-394509511bec/porter_cable_scroll_saw_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccd8a04b-5826-4bcc-bac4-998a62516854/why_is_my_stackable_washer_not_draining.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 5020 bytes
SHA-256: 13aa2a6d5eab6cd21bc95a50d1163ce3eaaac1c6ae4206eb9636cf90bc30e19c
font_01_sfnt_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 10532 bytes
SHA-256: 993baa407e514276a096cbdb363fa8816edc3629cf8e91593e72bca664f4d7bd
font_02_sfnt_off00011aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA3 16348 bytes
SHA-256: 2334ade245ec46eaa3943be3e15553e8ac07f98e23f092e9c17c46eab61462e4