Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48fdd51b8b8a1a2…

MALICIOUS

PDF

73.8 KB Created: 2021-04-16 20:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e53acecb17ca1cb7c713b8cb6669aca9 SHA-1: ef43fc17d30f28828b040664cd7d64bb1d42cb44 SHA-256: d48fdd51b8b8a1a24ce76b37af75514f5dfb02de1198fe2a6ef6a8595853045f
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 hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=workkeys+scores+gold PDF link annotation
    • https://katalulipof.weebly.com/uploads/1/3/2/7/132710678/verivaxab.pdfIn PDF document text
    • http://wabarexudit.iblogger.org/riwezogagebosajesem.pdfIn PDF document text
    • https://boxorefo.weebly.com/uploads/1/3/0/9/130969922/gilozeliwo.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/lajepujomawojomin.pdfIn PDF document text
    • http://kozupuj.iblogger.org/how_to_use_ozeri_scale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401983/normal_60687734c3f06.pdfIn PDF document text
    • https://padefogufagabak.weebly.com/uploads/1/3/4/7/134714354/luluvemamo.pdfIn PDF document text
    • http://sikevemekoma.mypressonline.com/53736983892.pdfIn PDF document text
    • http://puxekera.22web.org/68720748264.pdfIn PDF document text
    • http://kaxidabifibag.iblogger.org/93740482001.pdfIn PDF document text
    • http://toxedixekerej.22web.org/fagalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468286/normal_6064466f1ebc6.pdfIn PDF document text
    • https://lujotasapamuxa.weebly.com/uploads/1/3/0/9/130969194/panuliv-tebib-dodizowunavudu-tufedewegases.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wusozupit.myartsonline.com/bajodufemo.pdfIn PDF document text
    • https://13006a6e-9b3f-4191-9e3f-064114488741.filesusr.com/ugd/34464a_d824db208b6047b69a7415e1b4008a5c.pdf?index=trueIn PDF document text
    • http://dipagepe.atwebpages.com/barron_s_essential_words_for_ielts_audio.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_90d14b8c59444e90a9ac73831161b865.pdf?index=trueIn PDF document text
    • http://rowesupigoz.epizy.com/86253350500.pdfIn PDF document text
    • http://wekidezeze.epizy.com/video_trimmer_guru_apk_free.pdfIn PDF document text
    • http://tokeparab.epizy.com/c_books_for_beginners_free_download.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_off0000e2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BD 5076 bytes
SHA-256: 0ae55bd4100d5d24e65e9a13da64425166aea705b252c36463fbf5684a878620
font_01_sfnt_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 11224 bytes
SHA-256: 82b1ac80634287f1c331e04d4bf4f21162afd316a0788d7f017d286382e5783c

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