Malicious PDF — malware analysis report

Static analysis result for SHA-256 8829a0e1b9bbdcee…

MALICIOUS

PDF

78.5 KB Created: 2021-04-20 05:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1efee6d83eac994db15ee5b1d3d6b26 SHA-1: 83a4a84024d38c55908497b9cef328a115173fe0 SHA-256: 8829a0e1b9bbdcee915c848954d2692a228a02aa8a4a9b584f3b0fc0f09dc5e3
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV. It contains numerous embedded URIs, many of which point to disposable domains, suggesting a phishing or redirection attempt. The presence of a UTM term in one of the URLs indicates a tracking mechanism, further supporting a malicious intent to drive traffic to a specific site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/strik?utm_term=the+song+movie+poster+database
    • https://zuwubusonelab.weebly.com/uploads/1/3/0/7/130739898/xetiburu_taxiruseros_fuzazubukodufaf_robesef.pdf
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/pibanofenogod_xinejege_nirewatisim.pdf
    • http://pejokepi.mywebcommunity.org/34428376966.pdf
    • http://tediwaxivuj.sportsontheweb.net/handbook_of_local_anesthesia_6th_edition_download.pdf
    • http://tevaruv.sportsontheweb.net/26269831491.pdf
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/9120683.pdf
    • http://mavogevuz.getenjoyment.net/65527677140.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/3c81f77b-cf06-481b-ad37-bb7ae924badf/vigebe.pdf
    • https://uploads.strikinglycdn.com/files/57b4d552-1474-41c9-b4d6-0ca3a73e10a7/breakfast_at_tiffanys_book_analysis.pdf
    • https://s3.amazonaws.com/jeromisixinolib/turkish_march_sheet_music_flute.pdf
    • http://zubiluwetij.myartsonline.com/134123478.pdf
    • https://uploads.strikinglycdn.com/files/be5718ec-32f4-424d-b992-df9b3b424c1b/nenapitikumudog.pdf
    • https://uploads.strikinglycdn.com/files/1a8485cc-254d-4470-a166-5c24694d82cf/jupofo.pdf
    • http://xijewixevav.onlinewebshop.net/72514395364.pdf
    • http://tikeresepujel.onlinewebshop.net/94931424040.pdf
    • https://s3.amazonaws.com/zedilegol/dna_replication_worksheet_answers_biology_corner.pdf
    • https://uploads.strikinglycdn.com/files/ce874162-6023-450e-8398-c5dc5d82a3aa/wahl_trimmer_charger_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/25d21e71-0d92-4e5c-865f-282de3b27576/flowers_in_the_attic_1987.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_off0000e701.bin
11f8c1282e10cfe61a206a5098c0bb75c387651a0af05b685b6beadca14db4b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE701 5492 bytes
font_01_sfnt_off0000f982.bin
119805fa5140be5b6f2b4959f68654c4ddb586a4f1b649fc94537672a4d94afe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 11444 bytes
font_02_sfnt_off0001207a.bin
05ed5be796c151879aebc5527c2f5d56fadbde3f9ad90c3bd25b0d377d99d7a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1207A 2604 bytes

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