Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f250484509374f…

MALICIOUS

PDF

72.5 KB Created: 2020-12-30 11:08:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3c3fa37eb7395a866765ac80a9d05e02 SHA-1: 434bb20fd3a9ffa8a2384dd44f6a1e256120cbb3 SHA-256: b6f250484509374f6ac2da22860de240ab8c7a3935cce8be786088af71cff962
252 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to disposable hosting services and redirectors known for malicious activity. One critical heuristic indicates a direct link to a known malicious redirector, and ClamAV also flagged the file as malicious. The presence of a download button lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://traffine.ru/strik?utm_term=descargar+monster+ball+go+2 In PDF document text
    • https://lakujasoramaw.weebly.com/uploads/1/3/4/4/134400634/9bdf697599f222.pdfIn PDF document text
    • https://dududizenipurij.weebly.com/uploads/1/3/4/6/134651263/zuxez-vogejativezako.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/68f148888da839.pdfIn PDF document text
    • https://xinomufe.weebly.com/uploads/1/3/4/7/134706409/9197206.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/bararifozuv.pdfIn PDF document text
    • https://sibafuguwo.weebly.com/uploads/1/3/4/6/134679660/8582494.pdfIn PDF document text
    • https://ruvazokof.weebly.com/uploads/1/3/4/0/134040659/lupamajud-puvemupot.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/f655ecc6-a716-4df6-a2b9-0498f03f31e8/dufozobazufaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22383b30-d186-4feb-a419-504fa40737c3/notakebunatijodifenosup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89406e8-9cd9-41e3-8c2b-b0b8300d307c/hypello_potion_ffx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a51006b9-85af-4b04-8885-0fe5b8121161/ive_got_the_power_lyrics_little_mix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceb259ef-46fa-48cd-8ee3-38b9efd54c46/form_1040_instruction_book_2019.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_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 5388 bytes
SHA-256: 74ee422614f4f8dbbe0c5be11b142ec8972c5fc0cd16ded50dd95cf14b641bb7
font_01_sfnt_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 10560 bytes
SHA-256: e91aa38fdb09166e8ffff453a724e579da192b0e36854e6a0430204b7ede46fd

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