Malicious PDF — malware analysis report

Static analysis result for SHA-256 178add4fafe3a0b6…

MALICIOUS

PDF

74.6 KB Created: 2021-03-22 16:51:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 024d56f440b056060aeb152f0a240d05 SHA-1: bd6d0e007bbdac7ea3ad334cfef16c6625641f6b SHA-256: 178add4fafe3a0b6fa3e3509bb39a373fb6eb732d69fd8c564f4840ad02702a0
194 Risk Score

Malware Insights

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

This PDF document was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to potentially malicious content, with a specific focus on disguised PDF downloads. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/strik?utm_term=10000+reasons+matt+redman+mp3+download
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/godorerakas.pdf
    • http://tasefuvakol.22web.org/cadbury_nigeria_annual_report_2020.pdf
    • http://tufidifegoz.66ghz.com/navamosodetadakumum.pdf
    • https://xogudefimo.weebly.com/uploads/1/3/0/7/130775634/nelulajunapav-nakokefumif-runuw.pdf
    • https://cdn-cms.f-static.net/uploads/4489740/normal_5fe692ffd2c65.pdf
    • https://tajirokobi.weebly.com/uploads/1/3/4/9/134901714/3803600.pdf
    • https://futixaxez.weebly.com/uploads/1/3/4/5/134516919/6245048.pdf
    • http://desararixiwikos.22web.org/lista_de_antibioticos_veterinarios.pdf
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/vofaxevorabix.pdf
    • http://vivujivavo.iblogger.org/vukiteguvepibolamonog.pdf
    • https://kofulunaj.weebly.com/uploads/1/3/5/3/135320514/f95b33ff51.pdf
    • http://tesodip.iblogger.org/fifapiwudigegiwot.pdf
    • https://velonifiwivuli.weebly.com/uploads/1/3/0/7/130739758/gimojetowarusuki.pdf
    • https://mufewikusa.weebly.com/uploads/1/3/4/0/134042586/6971950.pdf
    • https://static.s123-cdn-static.com/uploads/4527859/normal_5ff9b38c8f5ad.pdf
    • https://funujitumim.weebly.com/uploads/1/3/5/3/135347265/570218.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sirowozikuko.epizy.com/ib_english_language_and_literature_guide_2017.pdf
    • https://s3.amazonaws.com/taturi/16640420635.pdf
    • http://temekem.epizy.com/archery_king_mod_apk_unlimited_everything.pdf
    • https://s3.amazonaws.com/pazatuv/rotuxudep.pdf
    • https://s3.amazonaws.com/jidagafinuxesu/cookieswirlc_minecraft_skin.pdf
    • https://s3.amazonaws.com/busutafitufe/tytera_md-9600_review.pdf
    • https://s3.amazonaws.com/bajuse/33995518407.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e49d.bin
fb7cfa8889ef143a124f775e752a4cbd1278b9101f78234b1576aabf1108e5fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE49D 5460 bytes
font_01_sfnt_off0000f726.bin
7f37c7a40c948e92a2c43595063ef2e09f124a06738529d15bcaefe93b00e5b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 11068 bytes

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