Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a27a08bbb933bf1…

MALICIOUS

PDF

75.8 KB Created: 2021-04-18 16:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d1a34cb2dfd3bcc777c2ebefe61b4399 SHA-1: 213067e3ba8558ba1b74e28b8c0d3f1050d844f8 SHA-256: 2a27a08bbb933bf1bc87b397b42c59920c3e713785148595c03f292806c94efa
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/strik?utm_term=how+to+change+air+filter+on+tempstar+furnace PDF link annotation
    • https://dedezeke.weebly.com/uploads/1/3/4/4/134494225/6725459.pdfIn PDF document text
    • https://tirugisig.weebly.com/uploads/1/3/0/7/130738706/wonaje_pigaduro_vojima.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/gTNqEhe/lasifu.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/cKichjP/new_hard_rock_music_bands_soft.pdfIn PDF document text
    • https://novunafa.weebly.com/uploads/1/3/1/3/131379228/nebalewutin.pdfIn PDF document text
    • https://cdn.sqhk.co/farukisinu/4jcidgi/60401934125.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xupimaral/how_to_clean_pampered_chef_salad_chopper.pdfIn PDF document text
    • https://041bbef9-4dd1-43b9-9ec7-2672afc16ec1.filesusr.com/ugd/686814_44f19cc2575d41a38c1515261ffa2242.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_5e3f547f65d8424ead0df1e0aee230fc.pdf?index=trueIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_b3ce5f88fd7f4e9c8cbc07e5a23c25af.pdf?index=trueIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_0b7ab737d2df4747a4c84a77603db6d7.pdf?index=trueIn PDF document text
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_5e3a4242d4f5437fb3b7ea5d32ccf720.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vapite/critical_race_theory_kimberle_crenshaw.pdfIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_7e699682edca458787929b6004a78923.pdf?index=trueIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_0bf6040047614be19a8c70d830245c24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/wukagozidelufukuvijado.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_6e67ba40140d4ed091eb427152184d2f.pdf?index=trueIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_91fcaea5510e4e0b9e7392d388a869ad.pdf?index=trueIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_2b98d6bb746c4a82bf0b2102df9526f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakadutof/jinavimeribakojogizula.pdfIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_97c68ae2205543e9a2ccaec78f3f0fc1.pdf?index=trueIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_0fa67808202e42d486079729064fdeeb.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_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 5480 bytes
SHA-256: b35342337fb0fb0a2f39fd8d6c0a90084221cb23de8007dee3745c3c36ac1f2e
font_01_sfnt_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 10264 bytes
SHA-256: 7365449d3b7c5b496fd41a0072ab13f7401c5f61743aa30f5f4694fc33700af5

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