Malicious PDF — malware analysis report

Static analysis result for SHA-256 098655e98c543719…

MALICIOUS

PDF

65.2 KB Created: 2021-03-03 16:13:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d888c39f489f2e6e198754a932f08684 SHA-1: 29e5622b090853a2f06081ffbe73c43ab6b7813c SHA-256: 098655e98c543719d298ab3829863d973e7d957b7ac25e2a1e6312ee19e77cc6
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with one prominent URL pointing to a website that appears to be a search engine result page. This suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure indicates a lure to external content.

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://crophysi.ru/wix?keyword=maytag+neptune+dryer+parts+canada
    • https://cdn-cms.f-static.net/uploads/4476429/normal_5fd2441e9dbed.pdf
    • https://static.s123-cdn-static.com/uploads/4388629/normal_5fe1c677dd824.pdf
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/jogivapaz_jagew_burolitimele.pdf
    • https://xogoluxoso.weebly.com/uploads/1/3/4/4/134444279/kasunapizuxek-sovarujome-davowu.pdf
    • https://static.s123-cdn-static.com/uploads/4485714/normal_5feb05dbad65a.pdf
    • https://ximapufem.weebly.com/uploads/1/3/1/4/131437784/6a8a1a.pdf
    • https://dozogifelezu.weebly.com/uploads/1/3/4/3/134313369/1585697.pdf
    • https://pibowalemarume.weebly.com/uploads/1/3/1/1/131164440/c55482381.pdf
    • https://gejowarog.weebly.com/uploads/1/3/2/7/132740172/5866509.pdf
    • https://bobiputab.weebly.com/uploads/1/3/2/8/132814039/zisezula.pdf
    • https://mafugefowodofo.weebly.com/uploads/1/3/1/3/131378796/fuvisak.pdf
    • https://static.s123-cdn-static.com/uploads/4426701/normal_5ff773766179a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wuwedilejom.myartsonline.com/cuantas_semanas_tiene_el_ao_2018.pdf
    • https://s3.amazonaws.com/fowikorejodi/nogixiw.pdf
    • https://s3.amazonaws.com/bagisi/speed_needed_for_streaming_tv.pdf
    • https://s3.amazonaws.com/rozebofukixus/zuxagegolirakizowutalik.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_off0000c225.bin
b6843dfe2ec774bf973376678fbb8f1334eaa3e7ccb5d1e0590052168e92e98d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC225 5316 bytes
font_01_sfnt_off0000d461.bin
7b9ade974e9d9121eb1f919d498d781bb9b61f54fabc77c08bf90db79d3dce43
pdf-font-stream PDF embedded font (sfnt) at offset 0xD461 10124 bytes