Malicious PDF — malware analysis report

Static analysis result for SHA-256 918e2b89c2d69a86…

MALICIOUS

PDF

81.4 KB Created: 2021-03-29 01:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3d0ecd02a55ca2a720bb4ee522168d8 SHA-1: 2cb9badcd751e879995b4c7fdcab02abe9f28d09 SHA-256: 918e2b89c2d69a86271ae98402fbafdd0d67e7712d14fd6201ed2dae495bb7a1
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, indicative of a link farm or SEO poisoning attack. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to external content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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 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/award?keyword=flutter+auricular+definicion+pdf
    • http://kixorita.22web.org/centos_6_live_cd_iso.pdf
    • http://pexukakadom.22web.org/business_model_generation_deutsch_download.pdf
    • http://wejaduz.mypressonline.com/finite_element_method_python.pdf
    • http://xugixejale.22web.org/bowurazor.pdf
    • http://jepegupunu.mygamesonline.org/liziwemodoxafop.pdf
    • http://kopogaxepaku.sportsontheweb.net/bikoxidugepokigujagasobo.pdf
    • http://giwewigipebi.medianewsonline.com/dewipilidowafazegiwel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_37808601ada0466c80eab15616503ef4.pdf?index=true
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_271a2afcf40c4a3d9457143bdda0ae5b.pdf?index=true
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_ce8d67ce55a84742aa076e00cf7a5756.pdf?index=true
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_235a5fdd5a354fe890f171be6a7ca7a0.pdf?index=true
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_46c72cee0bd4402c8d4ddf42f28ced46.pdf?index=true
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_28befa0b952847cb9c7cc64b66cf14ac.pdf?index=true
    • http://penobugixova.atwebpages.com/zeropozekizutamalazekol.pdf
    • https://uploads.strikinglycdn.com/files/22791774-89de-4040-8bcd-8fd00bffa72b/gubobakevesorib.pdf
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_60ff82c629394a1f949f47b3b5516275.pdf?index=true
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_881dcb0f4c0f4e7591c246f16c8ba890.pdf?index=true
    • https://s3.amazonaws.com/vaxebisapesi/aftership_app_apk.pdf
    • https://s3.amazonaws.com/tojazudibumogab/zogumukozawimevol.pdf
    • https://uploads.strikinglycdn.com/files/c6ead501-9eb5-4e5b-a64a-1b3013d13f65/danopezafu.pdf
    • https://uploads.strikinglycdn.com/files/85498e4e-5fc7-4081-a5a7-7c5212770940/mikakatajoxabibikavikekud.pdf
    • https://s3.amazonaws.com/towutoginadivu/78404143323.pdf
    • http://babokad.epizy.com/old_navy_dress_code_policy.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2da.bin
65203d0fcd495296c2c7f1015e848d6e808c4da7ac1f784cb4db665e06d87993		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 4808 bytes
font_01_sfnt_off00010339.bin
117ca7f32edc3a24a747b0388a11819d04e714fdaeaec86f4bb94518192841f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10339 11244 bytes
font_02_sfnt_off000129de.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129DE 4324 bytes

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