Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aef0acb779f9a18…

MALICIOUS

PDF

72.7 KB Created: 2021-06-08 19:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de45a1e22df2f37b733184db844d5d58 SHA-1: c439adf9e2bc9ef01a286b072257c67a214380cd SHA-256: 1aef0acb779f9a18416aca24e214b3a53bad810aa3551bd006d80fe0d7130f16
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, and is detected by ClamAV as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious or deceptive content, masquerading as homework answers. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/pbw?utm_term=inscribed+angles+homework+answers
    • https://cdn-cms.f-static.net/uploads/4413112/normal_6051fc53e0fde.pdf
    • https://cdn-cms.f-static.net/uploads/4446162/normal_605c93acd3854.pdf
    • https://lorudopop.weebly.com/uploads/1/3/4/3/134315835/kidigojonirovi_najukotig_fikejelogozoze_busupuko.pdf
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5ff68aca08fe6.pdf
    • https://vodivabowadabi.weebly.com/uploads/1/3/4/8/134877230/766013.pdf
    • https://cdn-cms.f-static.net/uploads/4495264/normal_5fe6cdba3069a.pdf
    • https://rimapinazovifu.weebly.com/uploads/1/3/4/3/134341399/satij-biwafevojupa-dilusez-tutumoda.pdf
    • https://cdn-cms.f-static.net/uploads/4471959/normal_6068cbca61656.pdf
    • https://jilowenuvugema.weebly.com/uploads/1/3/4/8/134897306/3252117.pdf
    • https://lefagetali.weebly.com/uploads/1/3/2/3/132302894/5c1de.pdf
    • https://gapixupat.weebly.com/uploads/1/3/1/6/131637313/wodujofunano.pdf
    • https://cdn-cms.f-static.net/uploads/4454286/normal_603bfded699b3.pdf
    • https://cdn-cms.f-static.net/uploads/4456369/normal_6054cef393196.pdf
    • https://static.s123-cdn-static.com/uploads/4455390/normal_5ff7735621580.pdf
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/lonedijisupof-zosizuxixazule-zososipogaw.pdf
    • https://static.s123-cdn-static.com/uploads/4378378/normal_5feb9a2417e7b.pdf
    • https://xuwumiguxapizif.weebly.com/uploads/1/3/0/7/130739656/mevazolegedu.pdf
    • https://nuxajitavira.weebly.com/uploads/1/3/1/8/131871558/2170597.pdf
    • https://mufunada.weebly.com/uploads/1/3/4/6/134623537/lapagafip-joxasu-wujobe-watiwobaliv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lifelekufa.pbworks.com/w/file/fetch/144498297/call_of_duty_mobile_garena_apk_obb_file_download.pdf
    • http://demopefo.pbworks.com/w/file/fetch/144602670/what_is_the_nutritional_value_of_beet_pulp_for_horses.pdf
    • http://palixazoke.pbworks.com/w/file/fetch/144427254/como_hacer_autos_con_cajas_de_carton_para_nios.pdf
    • http://rawumadakora.pbworks.com/w/file/fetch/144750702/bizetipadoxogadisal.pdf
    • http://mikabipi.pbworks.com/w/file/fetch/144821886/desowuzuva.pdf
    • http://natofuke.pbworks.com/f/sufeveruwaseniwegu.pdf
    • http://xobapotowi.pbworks.com/f/89395544686.pdf
    • http://gemometis.pbworks.com/w/file/fetch/144483060/wanelobememodabaxa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de27.bin
b46166c7c6480d6353f947519f92ce8b10c9453fa4e388b5162500a64a3b8739		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 5588 bytes
font_01_sfnt_off0000f107.bin
36f1d0bb7229070c7fa48f81eac2df7848eac91b333067132a40acbfd927c04f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 10452 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.