Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b082360097018b0…

MALICIOUS

PDF

86.4 KB Created: 2021-01-19 03:31:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 70fc193757d416ba43f0bb6c6e823413 SHA-1: ea1bab6fd8ac85e140bcb75f437cc7fa1f6fa241 SHA-256: 5b082360097018b0389d097ee8e4035fd020e75d0a5e717c958598f162f13d2f
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 pointing to Weebly-hosted PDFs, indicative of a link farm or SEO spam campaign. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the primary goal is to drive traffic to external websites. While no scripts were explicitly extracted, the presence of external links and the ML classification strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://leonvi.ru/123?utm_term=washing+machine+lint+trap+menards PDF link annotation
    • https://gadonivoxe.weebly.com/uploads/1/3/5/3/135331758/d0baa75ffe74.pdfIn PDF document text
    • https://dojeviwenos.weebly.com/uploads/1/3/4/4/134491393/defexetomobig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451025/normal_5fca0877b2c68.pdfIn PDF document text
    • https://farigelud.weebly.com/uploads/1/3/4/2/134266281/moxakefafo.pdfIn PDF document text
    • https://site-1197505.mozfiles.com/files/1197505/wudugasimimuluj.pdfIn PDF document text
    • https://site-1178304.mozfiles.com/files/1178304/european_history_textbook_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376126/normal_5f8e4228eca04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384645/normal_5ff97b2ccce41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_5fbaccc1777e6.pdfIn PDF document text
    • http://dolinunuridaku.iblogger.org/mevawid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476593/normal_5ff2f22b6aa87.pdfIn PDF document text
    • https://zikazofikadit.weebly.com/uploads/1/3/0/7/130739129/3990daa94817de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383689/normal_6000b8f786f4c.pdfIn PDF document text
    • https://site-1168357.mozfiles.com/files/1168357/49137563891.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/jasadavebaga/zimejiv.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 5176 bytes
SHA-256: 029efe25a71f6ebdb6411ebbc1d666d08d16045ea08b9b08e4c1187e429a777d
font_01_sfnt_off0001045f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045F 10564 bytes
SHA-256: baf131889ef6f8b7006963a443d6f62e015f2f7153e5daa9a5cc194cf0f4636d
font_02_sfnt_off0001289f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289F 16148 bytes
SHA-256: d612c605d101522a7b082cd092ef78b209dae850c4a5e940dd0f53fb1bc5669f
font_03_sfnt_off00013daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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