Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91b586c566524cd…

MALICIOUS

PDF

92.9 KB Created: 2021-03-17 01:34:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38be74c026f6c94ac1321a2b903b308a SHA-1: b78b4f54c5d582f17157fad7d9db1cc589612f27 SHA-256: e91b586c566524cdbfc98f22f8ac147601fd26c856b066ff69a946df2e4bb586
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 of which point to other PDF files, indicating a link farm designed to manipulate search engine results or distribute content. One of the primary external URIs, https://jumiwimov.ru/123?utm_term=aphorism+sentence+form, is suspicious and likely serves as a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/123?utm_term=aphorism+sentence+form
    • http://niwopofe.scienceontheweb.net/anesthesia_secrets_4th_edition.pdf
    • http://kifejuja.medianewsonline.com/47735430526.pdf
    • http://tiriruno.sportsontheweb.net/xuwivapotuvovoposojev.pdf
    • https://mupilikonibiz.weebly.com/uploads/1/3/0/7/130740066/zuxagagoso.pdf
    • https://nanupubixo.weebly.com/uploads/1/3/0/9/130969545/dejiripetofade_rokipos_bopebubowajo_wulixenew.pdf
    • https://meronikam.weebly.com/uploads/1/3/4/7/134705372/5965109.pdf
    • http://fajiriduxir.medianewsonline.com/78015135289.pdf
    • https://zixijatujomalul.weebly.com/uploads/1/3/5/9/135962278/ed2663c57998a0e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tawosutosuxi/app_cloner_mod_apk_1._4._19.pdf
    • https://uploads.strikinglycdn.com/files/47314c77-db22-4f28-b7fc-5099479ced1a/dbx_166xl_manuale_italiano.pdf
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_7e8ca8f737b140bebd5fdf01b1cf1baf.pdf?index=true
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_622e2a57fbb5493c9c2e3d4d9cacedb7.pdf?index=true
    • http://dokudaruriwiv.atwebpages.com/what_is_volumetric_efficiency_of_compressor.pdf
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_2b71cfbe35c6486da1d50ac1d7400855.pdf?index=true
    • https://s3.amazonaws.com/zetituri/icewind_dale_2_enhanced_edition_classes.pdf
    • https://uploads.strikinglycdn.com/files/5128c1fc-8d40-483b-9c02-6ba4075733d5/bushnell_ion_2_golf_gps_watch_reviews.pdf
    • https://uploads.strikinglycdn.com/files/c048f879-d083-4176-aa8a-46fe3e4e75b5/to_the_woman_i_once_loved_quotes.pdf
    • https://uploads.strikinglycdn.com/files/e81c5a1b-5ae5-4f89-bfc5-8ffda2888e9f/zufakavapodofoziroto.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ed6.bin
3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED6 6440 bytes
font_01_sfnt_off00012eca.bin
653b13c69056f1e7b9caed89664b1cc6aa6c62920ee085b21d1cc83f6de4dcd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECA 5000 bytes
font_02_sfnt_off00013faa.bin
de1e50121c5ae3a15b9155ca2d2c79db284da2c88312c153dd69a39a6dbe2be0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAA 11416 bytes

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