Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb343ce5f28ab6de…

MALICIOUS

PDF

83.4 KB Created: 2021-04-08 03:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bf7458d1d488fefc508590608bcd5b7c SHA-1: 9bc7f4846347a1467d96371dad47345da57a5544 SHA-256: cb343ce5f28ab6de560069d8298dd3c4b45cb6ab8a6757b287442c3a130a19df
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The embedded URLs, such as 'https://zajinet.ru/strik?utm_term=discovering+our+past+a+history+of+the+world+book', are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/strik?utm_term=discovering+our+past+a+history+of+the+world+book PDF link annotation
    • https://riguzegadediva.weebly.com/uploads/1/3/5/3/135314075/8425224.pdfIn PDF document text
    • https://xutepodufolesik.weebly.com/uploads/1/3/0/7/130739265/38b3b9c431a.pdfIn PDF document text
    • https://wodaxudufusan.weebly.com/uploads/1/3/0/8/130814186/walikutovewone-vutovixawolirep-majofarolafo.pdfIn PDF document text
    • https://zutijuxugovoxi.weebly.com/uploads/1/3/4/6/134684331/54249e0df.pdfIn PDF document text
    • https://dexixafavako.weebly.com/uploads/1/3/4/3/134348567/jezoruteka.pdfIn PDF document text
    • https://wadaxoleda.weebly.com/uploads/1/3/5/3/135311928/berudekuwaf.pdfIn PDF document text
    • http://buwewava.iblogger.org/what_is_the_best_bleaching_cream_for_your_skin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487184/normal_606acf8174de0.pdfIn PDF document text
    • https://kibolimu.weebly.com/uploads/1/3/4/8/134872751/gotepagegojubak.pdfIn PDF document text
    • https://ligotilup.weebly.com/uploads/1/3/4/3/134313371/bexikaxuwo.pdfIn PDF document text
    • https://rorobobadewa.weebly.com/uploads/1/3/1/1/131164171/65c114a0af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474191/normal_605f622330b83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_605ba91b5b98c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415929/normal_604b4c0ee125a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377902/normal_605c5c6378132.pdfIn PDF document text
    • http://gavowobow.iblogger.org/depevemenowanuxireva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wovugi/huawei_watch_gt_elegant_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df47fa0c-ae62-4add-81a8-85571c4ecb4b/does_the_bowflex_fold_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49487b20-82c3-4822-a379-00d0664ecdf2/69836693005.pdfIn PDF document text
    • http://ledudixip.epizy.com/11568445809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc0ed46-4ea6-40c2-91fb-bfc665c0c2b5/harman_advance_pellet_stove_parts.pdfIn PDF document text
    • http://wijopimitiraze.epizy.com/biology_book_for_class_9_kpk_board.pdfIn PDF document text
    • http://kogobobud.rf.gd/4340290730.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/dagewedetoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/827c7a5b-4a95-4e1b-88fa-4d67e92685b2/65319508816.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 5756 bytes
SHA-256: aad5f88d2d03deff1b1b0ed9598480f67556420ca113cae2907b9cf324141a0f
font_01_sfnt_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 11036 bytes
SHA-256: ac78541709d2e01436afac9e76f54406f32d42522240e2e00b3d675c1890a9c1
font_02_sfnt_off00013112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13112 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c