Malicious PDF — malware analysis report

Static analysis result for SHA-256 af30c5ffd6454c88…

MALICIOUS

PDF

81.0 KB Created: 2021-05-09 14:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0ba16fb09995df44eb13d04712d674e SHA-1: 97dc7a11c53a521e568baead915339d7a6e67a99 SHA-256: af30c5ffd6454c88f1591dd84732590b5ddf064244042818a7c1fe48b292f8af
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spam attack. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

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://pelibifir.ru/strik?utm_term=claviculas+de+salomon
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/1538495.pdf
    • http://powajaxib.medianewsonline.com/biography_of_kalpana_chawla.pdf
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/vupow_rigit.pdf
    • http://xokapik.mywebcommunity.org/21169373536.pdf
    • http://xiruzox.mygamesonline.org/85113756519.pdf
    • https://cdn.sqhk.co/letarezetap/glkiijh/37947139217.pdf
    • https://cdn.sqhk.co/bosamame/dicfXjh/my_talking_tom_friends_game_release_date.pdf
    • https://vilifamizebu.weebly.com/uploads/1/3/4/6/134617150/5d400d7a5c9.pdf
    • http://jiteruruw.sportsontheweb.net/top_300_drugs_2018.pdf
    • https://vabusise.weebly.com/uploads/1/3/4/3/134385335/notubovok-bejan-daxoriwutona.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/belapawerezuju/what_happens_if_there_is_no_quorum_in_the_senate.pdf
    • https://s3.amazonaws.com/daxemo/56169801265.pdf
    • http://sanugifop.atwebpages.com/rizemeju.pdf
    • http://redifigikutusoj.myartsonline.com/72985114920.pdf
    • https://s3.amazonaws.com/naxizugenabi/medidas_formato_a4_para_dibujo.pdf
    • https://s3.amazonaws.com/gowupuzokowuxes/vusegofedesalosad.pdf
    • http://mogewatiside.epizy.com/gukafavuforemogogumovawi.pdf
    • http://kesuzidadubitik.rf.gd/hashimoto_dieta.pdf
    • http://wawikoduvebakap.onlinewebshop.net/weekly_study_schedule.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_off0000fd00.bin
7317e56534c431f293e5ff4dcecfd8d85fc530b15848daa9f70ea62b0cb55495
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 4956 bytes
font_01_sfnt_off00010dc8.bin
feb348923a44e32e40640acb990ea7c6329fba4f56d3c02e1930ec341d2ff71f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 12756 bytes