Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7786228c32e113…

MALICIOUS

PDF

79.1 KB Created: 2021-02-26 15:07:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5700faec1e5588d349f0272c9dd2e38d SHA-1: 118ae8e69d73878243e8e18bfef7982cd2de9ca1 SHA-256: 3f7786228c32e113e7bf4a47f33b329d64b9887bb84454ba3aa5c8d190e11f61
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to drive traffic to potentially harmful content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jacksth.ru/award?keyword=sigma+bike+computer+calibration PDF link annotation
    • https://cdn.sqhk.co/kokademesuz/jbRriis/zunejafil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404745/normal_5fcf438542627.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/7moiiuw/ironite_for_palm_trees.pdfIn PDF document text
    • https://kilekofizinovi.weebly.com/uploads/1/3/3/9/133997912/7160179.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/oKhfSef/dog_cat_bird_hospital_phoenix.pdfIn PDF document text
    • http://desokore.medianewsonline.com/blood_bowl_death_zone_2.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/j5pjfgj/globe_prepaid_combo_promos_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/clHOVjc/can_you_find_your_facebook_friends_on_twitter.pdfIn PDF document text
    • https://cdn.sqhk.co/nugofonavuf/cm0p9Ia/monster_shooter_game_download_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/jiOibhg/13565120251.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/rowefukikevonotimosasoteb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392237/normal_60007cfc62894.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/hISgfvD/tadenovumatavude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411219/normal_6017b3ab19c27.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/hd8icI0/tezajatinumagebox.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/turip/indefinite_pronouns_worksheet_with_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/18943020853.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/wojukimevevowosu.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/fofeviba.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_off0000f8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 5380 bytes
SHA-256: 281ac236f121fce52438ce062bc6ed12f7fc9f7c159f7578f6c38f3c5e86233b
font_01_sfnt_off00010b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 10476 bytes
SHA-256: 862a745371d279364a6cbe671b8ac59076ba2978b0fc13e850a7bf826c578887

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