Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce31d9104ab9316…

MALICIOUS

PDF

80.4 KB Created: 2021-03-15 11:55:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0788a5f453d116717a174fffde048a59 SHA-1: 9d9019b04e3c63918342dcbbaa4f6182bd55ed45 SHA-256: dce31d9104ab9316ed5f79a97694fb83d72c4be32d980b52dcaaeb21076f6908
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=service+repair+manual+free+download PDF link annotation
    • http://creditscorecard.info/the_voynich_manuscript_full_book1dn6p.pdfIn PDF document text
    • http://good-production18.site/ranirotorofeapx8e.pdfIn PDF document text
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/ziveriput-xejataro-biluzonupubagad.pdfIn PDF document text
    • http://lessonsonline.site/youtube_video_downloader_app_mac4guj0.pdfIn PDF document text
    • http://dragonflysagewellness.com/27132692320yuilp.pdfIn PDF document text
    • https://jikumuwalomaj.weebly.com/uploads/1/3/1/3/131383204/b161235bdf6.pdfIn PDF document text
    • https://xupijologa.weebly.com/uploads/1/3/5/3/135327862/0932530.pdfIn PDF document text
    • https://lujovimujesami.weebly.com/uploads/1/3/4/0/134019161/5813fd200.pdfIn PDF document text
    • http://gsmall.space/derechos_humanos_de_los_estados_unidos23kfx.pdfIn PDF document text
    • https://zopogunonezaso.weebly.com/uploads/1/3/1/6/131637395/5812814.pdfIn PDF document text
    • https://tixiteto.weebly.com/uploads/1/3/5/2/135295688/soxafikunuw.pdfIn PDF document text
    • https://sefatepasegul.weebly.com/uploads/1/3/0/7/130775173/mokerokozizuniteki.pdfIn PDF document text
    • https://momekefu.weebly.com/uploads/1/3/4/8/134850451/6b1cf4ad9a1187.pdfIn PDF document text
    • https://tabejasutunuvi.weebly.com/uploads/1/3/4/2/134234833/96c844badb.pdfIn PDF document text
    • https://xibimitavidin.weebly.com/uploads/1/3/1/8/131871740/gezazawenuraban-peganibuwi.pdfIn PDF document text
    • https://faberumul.weebly.com/uploads/1/3/0/7/130739640/6772002.pdfIn PDF document text
    • https://divewamekavese.weebly.com/uploads/1/3/1/8/131860060/b4d502e35f724e.pdfIn PDF document text
    • https://kesadoxiluxar.weebly.com/uploads/1/3/5/9/135974677/vonagijodejatokasese.pdfIn PDF document text
    • https://pufedoxavode.weebly.com/uploads/1/3/4/6/134613169/3e91e8400cbb1b.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://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_f0fd9c9bb7124cd39ae65f57c08173c6.pdf?index=trueIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_65259b3da1d347049af36af7daad7370.pdf?index=trueIn 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_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 5180 bytes
SHA-256: e83e31e9c1b29745974e997508edda96e5780fa46b86cbe9a2969a63b68103ae
font_01_sfnt_off000100df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DF 10816 bytes
SHA-256: c9bf38dba035aebc4f16e1709f32328df95997fd79e8d063714abb8f99ee80bf
font_02_sfnt_off000125d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176