Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d035a814dcc6563…

MALICIOUS

PDF

77.7 KB Created: 2021-02-24 14:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d3bdfeee97afc78a0b00abe3e5ac46a2 SHA-1: 33d11f5dc097197d03005e09e00e865627f05dbb SHA-256: 4d035a814dcc65631282306f0587bb1d0fda9e03d950333f8fe9b2ab3753942a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, likely to manipulate search engine results or distribute further malicious content. The presence of multiple external links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wb?keyword=my%20friend%20dahmer%20steven%20hicks%20actor PDF link annotation
    • https://cdn.sqhk.co/vesotadenogo/47lhcji/fall_guys_switch_crossplay.pdfIn PDF document text
    • http://xiluzoxasefeb.iblogger.org/laloximuv.pdfIn PDF document text
    • https://cdn.sqhk.co/kedezoge/sdiihek/download_new_notification_sounds_android.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/situpipekuga-japogatorodesux.pdfIn PDF document text
    • https://cdn.sqhk.co/lajakukilo/jb6ggij/sitejevepotedafoselek.pdfIn PDF document text
    • https://sozuleku.weebly.com/uploads/1/3/5/9/135962343/1060142.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/hbiibge/drumstick_ice_cream_cones_walmart.pdfIn PDF document text
    • https://talegojozafadi.weebly.com/uploads/1/3/2/3/132303005/wevonuxanul.pdfIn PDF document text
    • https://dorenezawux.weebly.com/uploads/1/3/5/3/135383086/xotozul.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/izoSX23/the_smurfs_bakery_download.pdfIn PDF document text
    • https://dinidoleto.weebly.com/uploads/1/3/0/9/130969871/wiwubuf_nudapumoriziza_jaravo_wumiwelunexi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/juvetaso/jelefunobubelipu.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/xisobopofiguvegabefolemel.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/24142605430.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/72302351938.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/67982760435.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 5248 bytes
SHA-256: 8fc1b03a882f06f70921d0b90b62b76cda697f12053b2fcc3c296afe2101832b
font_01_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 10820 bytes
SHA-256: 3facd9e4fda412e1fef3dcb3b6487a42b3c6fba501420beb0728ae97ae210b4e
font_02_sfnt_off00011b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B58 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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