Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5729db9da13ea9…

MALICIOUS

PDF

82.4 KB Created: 2021-04-24 13:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a4649506567859f37653c5b999e1884d SHA-1: 866420dc173924f65faa7dbd2daaf0809f64250f SHA-256: 3b5729db9da13ea9b9d8e78f1cc145ed18aa0505b0541ccbe8baaa4e2efaedff
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains or link farms, indicative of a phishing or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=elements+of+art+line+powerpoint PDF link annotation
    • https://cdn.sqhk.co/pipujevi/8jaiht4/vozibawera.pdfIn PDF document text
    • https://bekitatabegoze.weebly.com/uploads/1/3/0/7/130775701/golorisija.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/LhcgdIu/destiny_child_game_art.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/feLhaQC/ice_cream_truck_menu_shirt.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/jfgiMDe/mejosiku.pdfIn PDF document text
    • http://nonuxuzelubit.22web.org/fiwalajovotawexajizat.pdfIn PDF document text
    • https://vebajixumese.weebly.com/uploads/1/3/4/4/134483039/rasukujixogunoral.pdfIn PDF document text
    • https://wosufibataba.weebly.com/uploads/1/3/4/8/134866098/2699850.pdfIn PDF document text
    • https://cdn.sqhk.co/bisulalu/QUjbjgq/xeketowatunamusigawaxemak.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/amPKZgj/autobiography_of_abraham_lincoln_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kanemili/dphjCii/kibuzuzusavopivosubidiro.pdfIn PDF document text
    • https://vuwisirikufav.weebly.com/uploads/1/3/4/7/134765545/xopirojepiruzipes.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/orca_quantum_chemistry_software.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
    • http://sitafefisoju.atwebpages.com/zujelibikilisigogamolaw.pdfIn PDF document text
    • http://wasupedojewemo.epizy.com/lilunodisipedowomu.pdfIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/behavioral_neuroscience_8th_edition_breedlove.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 4884 bytes
SHA-256: fb36f22ff266c2cb61a962ced2d25ad4565856118fa4b88aec13f6be48d55df0
font_01_sfnt_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 10928 bytes
SHA-256: 85e857fbde7ac41812de7c708ee8fda213f841052492429d55ee4b3a055a4c26
font_02_sfnt_off00011950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 16116 bytes
SHA-256: 757edbe9ca696dc752e8794cc2fab55b744a24b197aba41abea0c8f583a0f3ca
font_03_sfnt_off00012e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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