Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfda77c4275cad8…

MALICIOUS

PDF

84.2 KB Created: 2021-03-19 21:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d5eb71129095284b5426ed96a703ada SHA-1: 5e7834a70d124fdb2fb30da1e56c408722ddc27a SHA-256: adfda77c4275cad812675da08943ffa3a0a01f14238cefc7ae1adc0388512913
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized to appear as legitimate search results for popular content like 'volo's guide to monsters 5e pdf download'. This technique is commonly used to redirect users to phishing sites or download malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=volo%2527s+guide+to+monsters+5e+pdf+download
    • http://rubka.space/467330795681u753.pdf
    • http://mail-autoscout24.net/how_does_a_rudder_on_a_plane_work1nkvp.pdf
    • http://idealicacolumbia.site/how_to_take_apart_a_hi_point_380t56y8.pdf
    • http://recepty-dd.info/20681352432xxtmn.pdf
    • http://nusixogej.iblogger.org/gore_creek_co_fishing_report.pdf
    • http://libralab.digital/is_the_lincoln_mkx_a_reliable_car2px5x.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_927f1a88d6074176b9415ab78242becf.pdf?index=true
    • https://s3.amazonaws.com/rexogeguxosix/goponifemuvejepegela.pdf
    • http://varepekolati.rf.gd/batman_full_hd_wallpaper_free.pdf
    • https://s3.amazonaws.com/goneduzum/jdk_8_linux_64.pdf
    • https://s3.amazonaws.com/getizar/91184533690.pdf
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_df6863c30e864ea297e1f5cb82fa59b1.pdf?index=true
    • http://mekazejirorarad.epizy.com/incident_report_sample_word.pdf
    • https://s3.amazonaws.com/pisik/wallpaper_apps_for_android.pdf
    • http://pukewideje.epizy.com/tawifon.pdf
    • https://s3.amazonaws.com/penale/alfabeto_hebreo_espaol.pdf
    • https://s3.amazonaws.com/mogipegi/bolodedeloleliwulalus.pdf
    • https://s3.amazonaws.com/fexuror/anaconda_sametha_movie_songs.pdf
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_24fdbb1fc8434797b552d521897d06fa.pdf?index=true
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_aba6642b96e14591b2f63caa5f943acc.pdf?index=true
    • 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_off00010889.bin
331e74854428ef905786e97b7c87549bec0fd60059890e292d190bc7bb55e6dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 5576 bytes
font_01_sfnt_off00011b89.bin
0ee18c19eb1646a9562c9fe8c6d8a4a58eedd230f5f31bd0a2bb0851b43bb440		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B89 11252 bytes

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