Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a55593fda036d02…

MALICIOUS

PDF

75.5 KB Created: 2021-02-19 15:18:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 42e8dc19e66c5f6d875698917cd3a69c SHA-1: b7028546d9dc58a1dc3eae9b32ddccd5187ba497 SHA-256: 7a55593fda036d02bac831d9d89bc33fb2c41af30a85371716d96aeae85b533e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=mi+serie+de+televisi%25C3%25B3n+favorita+era+los+serrano.+era+una+serie+tan+buena+que+dur%25C3%25B3+ocho PDF link annotation
    • https://tudaluvakagovax.weebly.com/uploads/1/3/4/6/134614365/59da2a74d47c.pdfIn PDF document text
    • https://bekodezu.weebly.com/uploads/1/3/1/8/131856725/b5d818.pdfIn PDF document text
    • https://resojuwow.weebly.com/uploads/1/3/4/3/134351964/begij-rufoxolidedakam-ganisoduxotaxo.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/mhaidpd/world_war_one_interesting_things.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/gifogirezomajet_pobozejed.pdfIn PDF document text
    • https://cdn.sqhk.co/ninevowa/Fjjjeji/the_ordinary_skincare_review_dermatologist.pdfIn PDF document text
    • https://cdn.sqhk.co/mozopojugode/KawchcS/best_tool_kit_for_homeowner.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/AzhdhfV/call_ducks_for_sale_in_texas.pdfIn PDF document text
    • https://xugibadibexupov.weebly.com/uploads/1/3/4/6/134684970/8553a2a14.pdfIn PDF document text
    • https://garujidizog.weebly.com/uploads/1/3/1/3/131398488/dd11237e38fa.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/jcEo7uN/manicure_natural_nails_near_me.pdfIn PDF document text
    • https://kuviwavu.weebly.com/uploads/1/3/1/6/131606254/2044ee913322d6c.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/jb1g6ic/kusawixupuxedewaxavop.pdfIn PDF document text
    • http://sethel.xyz/vunadixebikikezyxie.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/libeganot/fedex_ltl_bill_of_lading.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/lebenuxevidofotad.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/abstract_love_images_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/doyles_guide_employment_law_barristers.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/chartered_accountant_letterhead_format.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_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 5608 bytes
SHA-256: caccb3f9aa11cd8d579d524c20b5895fb8ebc36e777009955a8b634ec8e7721a
font_01_sfnt_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 13336 bytes
SHA-256: 9fe02e9028b7e9f87794e8c4c834892608812ff2fd05522e0ce39b4054174ad1

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