Malicious PDF — malware analysis report

Static analysis result for SHA-256 14071abb8f73b989…

MALICIOUS

PDF

39.8 KB Created: 2020-11-08 22:23:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 42f703be09743500db13cf19a1d5c1ea SHA-1: 53c426e2dab5b36b19d7e72caa73e6e08647bd15 SHA-256: 14071abb8f73b9890518169395f732ab52bf7a6d96f4b35db62c920ebf63af46
86 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. 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 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffset.ru/123?keyword=middleton+s+fish+camp+lake+blue+cypress PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388177/normal_5f91f4515bb98.pdfIn PDF document text
    • https://fotijaxak.weebly.com/uploads/1/3/4/1/134108731/3b1a9f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423137/normal_5f9cc70fec5e2.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/dalud.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/regovadeje/google_classroom_stream_tab.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/anemometer_working_principle.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/kabesurunepejixifofo.pdfIn PDF document text
    • https://dukugasamu.files.wordpress.com/2020/11/zufazixinapa.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/perfect_english_grammar_causative.pdfIn PDF document text
    • https://ponavawamu.files.wordpress.com/2020/11/72431456636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6469f10-95dc-4137-b76e-e6b703c8e1e9/37080405455.pdfIn PDF document text
    • https://pomutap.files.wordpress.com/2020/11/3_dot_tattoo_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/digestive_system_worksheet_grade_8.pdfIn PDF document text
    • https://nixeporebumo.files.wordpress.com/2020/11/attack_on_titan_episode_16_english_dubbed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad711af6-6074-49d5-91b4-5333b10150e1/company_commander_oer_support_form_example.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_off00005c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1D 5704 bytes
SHA-256: 199d1dda9ef277157816425cfedcfd997fee0fa60e8bc3d3bd9c5e0c85f58fec
font_01_sfnt_off00006f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6E 10180 bytes
SHA-256: 5b46185fce9be448f62fce060e971aaa694e9c8582bcd609f1a0ea7185517989