Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9838b2eb7d50745…

MALICIOUS

PDF

68.2 KB Created: 2021-03-27 21:50:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 25cd5a25ef77f43aecd24ec855b46120 SHA-1: 2053cc443b3419d01ccd0c048176d0cd5c94abe1 SHA-256: c9838b2eb7d50745e35242a892c08ca565819b91330fe8afda8ba8246e7b32e5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious sites, possibly for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=it+will+rain+piano+letter+notes PDF link annotation
    • https://jetezilim.weebly.com/uploads/1/3/0/7/130775858/pedakonunigi.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/9568304.pdfIn PDF document text
    • http://suwefazimim.medianewsonline.com/easy_christmas_carols_guitar_chords.pdfIn PDF document text
    • http://xozowilozoga.mywebcommunity.org/zizibekidoze.pdfIn PDF document text
    • https://sinuxogutit.weebly.com/uploads/1/3/4/5/134505158/dupurena_belewevazebetif.pdfIn PDF document text
    • http://zevibeponakat.getenjoyment.net/12990108133.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/25701454557.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/09696682-0485-460f-acef-ff8b18d7c5f8/gigekebinivap.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/81383417273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23fbe448-c38f-463c-be1e-74d11a219f26/fisanigotinumowixope.pdfIn PDF document text
    • http://bagasukozu.rf.gd/teamwork_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf0b656-9fd9-46a0-a218-b4d8d4219949/intermediate_algebra_graphs_and_functions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/where_is_the_best_christmas_lights_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ca0bc8c-11f2-4305-aed9-d936d6d54109/ncees_fe_civil_practice_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63d5e83a-573a-4db9-b030-7b048daae7df/coleman_spa_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb0612c-6b2a-4502-8dc7-3638855721ab/nys_dmv_cdl_b_practice_test.pdfIn PDF document text
    • http://rokimaligevijep.rf.gd/history_of_computer_hardware_and_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c216500-7682-4447-b251-6e062bab9828/diy_dog_bow_tie_tutorial.pdfIn PDF document text
    • http://bexumasifawej.epizy.com/handwriting_template_cursive.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_off0000d167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD167 4844 bytes
SHA-256: acc2d67beed8f9244dc97fb06ea0b9a6e63e86d7741d8054c3531ab5b2553aee
font_01_sfnt_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 10240 bytes
SHA-256: c6896837eebfa9d46caf2bbbcade215a1e07638b917ab76cdeed9560bf12ab72