Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a53759dec3132d…

MALICIOUS

PDF

78.0 KB Created: 2021-03-31 22:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d6c750405106d8acf2d30e7768040b66 SHA-1: b831a917dbeff179ab5d21a89a9beca34925fee6 SHA-256: 20a53759dec3132df681a3b966f3e67a631a2a8a40b4903db13ded51856f8958
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/wix?keyword=ip+man+4+full+movie+download+filmyzilla PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372753/normal_6058f06e18907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388405/normal_6019b475176e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_60565a7ca2212.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408180/normal_5fd04abf519fd.pdfIn PDF document text
    • http://13millions-warzone.store/881959565219145g.pdfIn PDF document text
    • http://itnegozio.info/jibexunolul157z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426062/normal_603f758bb187f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_603bc89222cb8.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/36f545e2-9814-4709-927b-a0fa2b1a1ecd/beginning_r_the_statistical_programming_language_book.pdfIn PDF document text
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_e9d263df32574286a97ce7c381a82354.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/130f22cd-ba13-4458-9a5b-eb7e588cefc4/braun_thermoscan_7_with_age_precision_irt6520_ear_thermometer_digital.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4504e3-36a8-484a-895d-6062483218b6/93939751502.pdfIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_0f91ca02f96e47a689fae74f1694d00f.pdf?index=trueIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_7029d16761584794baf09dd81730b8f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bcb3aa1-fd06-4d8d-a6b8-9082c9eb3ecd/91455422597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8caff10d-1978-4199-8079-04d6ac8a0eec/wikabib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f6e14c-73c4-4549-af21-8cb0fcb94269/vefonefadeneguzilunaba.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_ef035f86e615453e8fec91bd8a4d6ca3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f57bc2-3bbc-490c-b9eb-0444bd2244e1/how_to_prune_a_multi_trunk_tree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4c2d100-6b6b-4b36-9695-60ada3635e5f/do_dominos_employees_get_free_pizza.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_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 5240 bytes
SHA-256: 05985f649aaaf70373a672c9e2c8016cd82c7788bfbb14c99c8a083263e64eef
font_01_sfnt_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 10976 bytes
SHA-256: 18a666d5b9981753334123f6e76b4f327c5db487d9140e0e414dd52874071c86