Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dabdcd3a9204bcf…

MALICIOUS

PDF

77.8 KB Created: 2021-05-08 18:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 370a37276c569444b3d0e3c24b557fbc SHA-1: d75b311fd7972f6e678ad1e75cdb863ed6d76666 SHA-256: 4dabdcd3a9204bcfdb7ab8dac0778003dea65f943767c4b4d10ff530a60be48d
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, many of which are hosted on disposable domains and appear to be part of a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the attack pattern.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=camry+2020+awd+price
    • https://xigolomo.weebly.com/uploads/1/3/4/4/134483438/tasosimadatijep.pdf
    • https://cdn.sqhk.co/dinigivo/td3hbxi/lucky_lanes_bowling_alley_denison_ia.pdf
    • https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/kenusegexuxak.pdf
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/dafaxeperozijiru.pdf
    • http://jerunurijo.iblogger.org/tuxomudomovuzafux.pdf
    • http://buvavarosavadar.iblogger.org/arunachal_pradesh_tourism_video.pdf
    • http://zovolexune.sportsontheweb.net/oxidative_phosphorylation_mcq.pdf
    • https://nubajegi.weebly.com/uploads/1/3/0/8/130814178/41f1120dfb6f.pdf
    • https://cdn.sqhk.co/nobipajami/ggglghA/53262384773.pdf
    • https://mizemajawoxulu.weebly.com/uploads/1/3/1/4/131437858/dovupe_sewinowesuzajag_gorevozunutidur_nimubevela.pdf
    • https://gosasaweju.weebly.com/uploads/1/3/1/3/131384289/932230.pdf
    • https://tokubarip.weebly.com/uploads/1/3/1/3/131380438/e73381282.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/mulerux/vishnu_sahasranamam_lyrics_in_malayalam_format.pdf
    • http://jusujewepexu.epizy.com/36897803078.pdf
    • http://xabiworaw.epizy.com/do_subarus_have_transmission_problems.pdf
    • https://s3.amazonaws.com/meludav/jacuzzi_bathtub_repair_manuals.pdf
    • http://nivuzujanux.myartsonline.com/mokol.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_off0000e632.bin
0ac38372504edd1bce9dc37aeef879957295e3eb9131389cb4ae833e68745bb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 4992 bytes
font_01_sfnt_off0000f743.bin
c633a96bb44016f2416902d131d9e41b133491797f2ae7c8e3e97b89c66b7ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 10820 bytes
font_02_sfnt_off00011c58.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 4324 bytes

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