Malicious PDF — malware analysis report

Static analysis result for SHA-256 3457c1f07a1ac5c3…

MALICIOUS

PDF

89.4 KB Created: 2021-03-14 11:26:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 51e799a28c72be3d338f0abb6d2bb30d SHA-1: ef6a0cacaf6b7448e7ba599c3f5ff504dbde0207 SHA-256: 3457c1f07a1ac5c3c99c4da80aef274684701680b9cc6dc2791f3333c0c8412a
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. The heuristics reveal it functions as a link farm, containing numerous external URIs, with one prominent example being 'https://xezojetit.ru/123?utm_term=akihabara+figure+shopping+guide'. This suggests the PDF's primary purpose is to redirect users to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/123?utm_term=akihabara+figure+shopping+guide PDF link annotation
    • http://pugalibapuf.iblogger.org/maze_of_bones_book_trailer.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/birthday_cake_images_for_mobile.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_a6b472e542ea42d190efc8d9677514ff.pdf?index=trueIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_f888d814184044488d3cd56ac724dc20.pdf?index=trueIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_464fd4788cd3446fae22f624ffccad89.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/37979473333.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_95712342ac21424ba1712a4008ee9789.pdf?index=trueIn PDF document text
    • http://mifefidaleriba.epizy.com/45931253652.pdfIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_5f88e3c761c1442b8407d0c4dc2f44db.pdf?index=trueIn PDF document text
    • http://vuxomilowes.rf.gd/84506259916.pdfIn PDF document text
    • http://wepilige.epizy.com/94650556755.pdfIn PDF document text
    • http://dalezogidaxi.epizy.com/what_is_significant_about_the_structure_of_hills_like_white_elephants_select_all_that_apply.pdfIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_fe07ecbbb76642bbb1d333a84891aaed.pdf?index=trueIn PDF document text
    • http://tabewozuzigenog.epizy.com/87970513456.pdfIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_7f9f38b5dbf94795a78f89c2c5a2c24d.pdf?index=trueIn PDF document text
    • http://kixepuvun.epizy.com/vinenuzimusu.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/human_relations_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/disneyland_resort_paris_case_study_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/affidavit_of_loss_sample_format.pdfIn PDF document text
    • http://gesasodalunaka.epizy.com/causes_of_deafness.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 2860 bytes
SHA-256: e78124f80f364e49106e055280766ca1754aad3e858f9654909052ff4dfe2816
font_01_sfnt_off0000fd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 5464 bytes
SHA-256: c752d6da60d5b27cb6630b0b09e64576ab4fb1b154a62254c8b6e1e493e0d332
font_02_sfnt_off00010ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF6 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_03_sfnt_off00011883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11883 11636 bytes
SHA-256: 0771373a45261897d797254972a84916afcc41195920c9471d6bfbfe371acbf0
font_04_sfnt_off0001403f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403F 16216 bytes
SHA-256: fb0a2b6d6771318e63366743fe8e0b6518a7c64dffafd57f2a59f117e1f3e529

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