Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b4deca376ef18e…

MALICIOUS

PDF

82.3 KB Created: 2021-03-15 14:50:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4a6929b823360d95ed6db6ce0e6064d9 SHA-1: d92b2b4c0c5b46424c43abdd882a364b3d55ad95 SHA-256: 77b4deca376ef18e049aef0c13a7d0e080aa56d7e841c2abc7789375197a743e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and hosted on services like weebly.com, indicating a link farm designed to distribute traffic. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a tactic to generate traffic for SEO purposes, likely to host phishing pages or further malware. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xajibur.ru/award?keyword=french+revolution+pdf+notes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372360/normal_60077164d6051.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/26067398202.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/2510e4036.pdfIn PDF document text
    • https://vitojeji.weebly.com/uploads/1/3/1/4/131453493/ac93a7ae7.pdfIn PDF document text
    • https://xupalodigodub.weebly.com/uploads/1/3/5/2/135298884/9233116.pdfIn PDF document text
    • http://malapiwo.66ghz.com/sitiwesasakiwepafazaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422373/normal_5ff194a3c0452.pdfIn PDF document text
    • http://zivemigidefis.mypressonline.com/95078015030.pdfIn PDF document text
    • https://metogixum.weebly.com/uploads/1/3/0/7/130775033/6736174.pdfIn PDF document text
    • http://zuduwamani.mypressonline.com/51487435174.pdfIn PDF document text
    • https://walamezer.weebly.com/uploads/1/3/0/7/130740591/6992653.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365602/normal_5fed05eb663ee.pdfIn PDF document text
    • http://tuwukadinem.mygamesonline.org/91583439757.pdfIn PDF document text
    • http://wajofima.mywebcommunity.org/bixididagifativez.pdfIn PDF document text
    • https://xidibifolun.weebly.com/uploads/1/3/2/7/132710634/gepil.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/1887825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380090/normal_6030d468e02e6.pdfIn PDF document text
    • http://fupemagis.mywebcommunity.org/digupojobenuw.pdfIn PDF document text
    • http://duzixofiwisegi.mygamesonline.org/what_are_the_features_of_the_government_of_india_act_1935.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tivakifuzir.atwebpages.com/686021394.pdfIn PDF document text
    • http://juwesuzibu.epizy.com/travel_gift_voucher_design_template.pdfIn PDF document text
    • http://damowepoko.myartsonline.com/world_war_z_book_ending.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/what_is_punctuated_equilibrium_model_in_biology.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 5048 bytes
SHA-256: 32abc13039f598c2e3dbebe25dd3de6a7c2d6968e7ca26529793966e24104c47
font_01_sfnt_off000102d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 10316 bytes
SHA-256: e8590828e184bec4df76edb39e6f9ff9eefb5dd98bb1b6859a308bac918f1976
font_02_sfnt_off00012661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12661 16224 bytes
SHA-256: 3230dce6ac9cc1c618afe6e700bc01bad4c14b8490cb7e773368fe91bfaf5e97