Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99be2b5c6c33dd1…

MALICIOUS

PDF

71.3 KB Created: 2020-12-17 21:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 135cde2b8ec106f04ea9ea23f496ae13 SHA-1: 740a8700dd26e30db9b7d7411fe8e00ef73df303 SHA-256: e99be2b5c6c33dd1e91e194cd8937d990974cabe04592da0b92854dbd14fde8f
214 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to known malicious redirectors. The document body, though heavily obfuscated, appears to be a lure for a link farm, aiming to direct users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, indicating a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/aws?utm_term=example+preliminary+bibliography+mla+format
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/d5072.pdf
    • https://teguvubab.weebly.com/uploads/1/3/4/3/134347924/3ce402036d03b51.pdf
    • https://vodemilofokuse.weebly.com/uploads/1/3/4/2/134235674/9595908f.pdf
    • https://pipoxaxem.weebly.com/uploads/1/3/4/4/134498503/woxubunetaze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b04d6e9b-ffd8-4b8f-8b49-9ca44905ec66/mezujutise.pdf
    • https://s3.amazonaws.com/gagagakigibapo/cronica_de_una_muerte_anunciada.pdf
    • https://uploads.strikinglycdn.com/files/9a1dc896-59e8-4ed2-bcdf-68ec4d661726/honeymoon_from_hell_movie_ending.pdf
    • https://s3.amazonaws.com/regufojalojaza/47558231841.pdf
    • https://uploads.strikinglycdn.com/files/d1a873a6-fe5a-4410-84ca-1696b37a7dee/14896930561.pdf
    • https://s3.amazonaws.com/lopadivupudexa/ligozawinumifogugadojev.pdf
    • https://s3.amazonaws.com/lusabifef/legabepegezamiweku.pdf
    • https://s3.amazonaws.com/bubeto/calendar_ortodox_2019_stil_vechi.pdf
    • https://s3.amazonaws.com/zokokamu/jarabe_tapato_jalisco.pdf
    • https://s3.amazonaws.com/lanowilovuviwib/rumi_poems.pdf
    • https://s3.amazonaws.com/gofiguj/perepabuzapib.pdf
    • https://s3.amazonaws.com/sukobogixe/puestos_de_trabajo_en_un_hotel_lista.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce55.bin
9770345e6d5e53ece970d0f3e879fb43e0da55f39048d22bc9529051b3771242		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE55 5192 bytes
font_01_sfnt_off0000dfdd.bin
5b8bc8a1d14ed659ddef2ec55c0e971bb56e9c159bedc686ab588188a5c2b0bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 10048 bytes
font_02_sfnt_off000101f3.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 4324 bytes

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