Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef38f58d3aa54f97…

MALICIOUS

PDF

77.8 KB Created: 2021-04-17 04:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: aefad0013c042b08df1a8257f1fb9539 SHA-1: 059560b633cc691204dd6af8ffa53cc37fe21bd6 SHA-256: ef38f58d3aa54f97deb6f8741fd850a5265198be655516bedeb8a9d31bcd2ff9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/strik?utm_term=what+makes+up+a+complete+subject PDF link annotation
    • http://guketepudepi.iblogger.org/attestation_sur_l_honneur_de_non_activit.pdfIn PDF document text
    • https://xesusufekab.weebly.com/uploads/1/3/4/8/134864027/zuxukawi.pdfIn PDF document text
    • https://powufekati.weebly.com/uploads/1/3/4/0/134012492/8412630.pdfIn PDF document text
    • https://lepifokofufup.weebly.com/uploads/1/3/4/0/134018260/regubogewevapof.pdfIn PDF document text
    • https://devogenigibef.weebly.com/uploads/1/3/4/5/134501446/396487.pdfIn PDF document text
    • https://bafiredevidif.weebly.com/uploads/1/3/1/3/131384403/1169915.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/hp_photosmart_7525_printer_user_guide.pdfIn PDF document text
    • https://xipuzitob.weebly.com/uploads/1/3/4/5/134523495/2632608.pdfIn PDF document text
    • http://zinuxuf.22web.org/simplemente_inolvidable_mary_balogh_descargar.pdfIn PDF document text
    • https://ximapufem.weebly.com/uploads/1/3/1/4/131437784/zedonogukefofur-mules-farapid-dududakipa.pdfIn PDF document text
    • https://gadefume.weebly.com/uploads/1/3/4/3/134337819/vazek_kamigunamir_rijeromovebusob_juvaxole.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nopugorib.onlinewebshop.net/bonfiglioli_planetary_gearbox.pdfIn PDF document text
    • http://xifuwezu.epizy.com/80377953380.pdfIn PDF document text
    • http://fuzufoxuja.epizy.com/pallet_truck_servicing_near_me.pdfIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_baa39faf861b4e2695194647d183e0ea.pdf?index=trueIn PDF document text
    • https://bc881323-2374-4635-a2b7-f126f9929bd8.filesusr.com/ugd/546a35_9b087720ebc743a0aa2e77d03d4f6f6a.pdf?index=trueIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_8e7cd935f484463e882aa5c9be7b7aa5.pdf?index=trueIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_1ec93b52fae14ea19f54f04fd216ca08.pdf?index=trueIn 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_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 5372 bytes
SHA-256: 616630de9d79c2d87f0c7af6f4ca5aa56105a5fd6cf63c60c19f6bcb79ee8e9f
font_01_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 10440 bytes
SHA-256: a79aa904a771a56bfadf8710a4b1c0f3f98e09ed875a87e13331dc9c0f9e7c8e

Open this report in the interactive analyzer, or submit your own file for analysis.