Malicious PDF — malware analysis report

Static analysis result for SHA-256 332ec85790326047…

MALICIOUS

PDF

70.6 KB Created: 2021-03-12 14:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca37c92d2bd44acfc210eedbeb6ad5c0 SHA-1: 28e297f08cab305bd3edfd9160d0abcb65c462d6 SHA-256: 332ec85790326047e63662e6ddce75c50701b6fdb701c8505fa89c4f8117f3c0
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an external URI pointing to a URL that mimics a free book download, suggesting a social engineering lure. While no scripts were directly extracted, the presence of embedded URLs and the nature of the detection indicate a phishing attempt designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://vilenefex.ru/award?keyword=knowledge+encyclopedia+book+free+download+pdf
    • http://efarbok.xyz/siratep9522d.pdf
    • http://bratskpravojur.ru/brain_teaser_puzzle_books_for_adults1pamp.pdf
    • http://manovina.mypressonline.com/wefizosoworuzaravewaxezas.pdf
    • http://tujidal.mypressonline.com/26191403494.pdf
    • http://vumajufeboxidik.mywebcommunity.org/how_to_reply_for_thank_you_email_from_boss.pdf
    • https://pavibizad.weebly.com/uploads/1/3/0/7/130740264/1049f702f42.pdf
    • https://povurumupun.weebly.com/uploads/1/3/4/8/134884194/wefulelixanutuf.pdf
    • http://mbfsopg.com/stihl_ms_170_bar_oil_adjustment70tth.pdf
    • http://bcpzonasegur4viabcp.com/britannicus_playthqfq.pdf
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/2492807.pdf
    • http://letinebab.mywebcommunity.org/antioxidant_activity_of_plant_extracts_containing_phenolic_compounds.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mepitar.atwebpages.com/43289679552.pdf
    • https://uploads.strikinglycdn.com/files/993c4325-ff00-47fe-8a58-60e81dc3e970/lilipufugeperikuwurixixo.pdf
    • https://uploads.strikinglycdn.com/files/804f35ca-1428-4ed8-9c4e-6b7c340d7e18/how_to_manifest_a_financial_miracle.pdf
    • http://zejibanunepi.myartsonline.com/how_did_the_amnesty_act_of_1872_influence_reconstruction_brainly.pdf
    • https://uploads.strikinglycdn.com/files/e251e21f-eb27-488c-801a-7ccd9023e338/vaxaxifilamudajizaz.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_off0000d681.bin
f741bf0fd3d7353ef3bdf25a994a06653e568c1d4e7e390989bbe4193893b9e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 5512 bytes
font_01_sfnt_off0000e970.bin
6e91aafdce7832e7e11ee23e471827be83a50fecc0c1462471f136b252ccbcc1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 10572 bytes