Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ac89d76660999b…

MALICIOUS

PDF

72.8 KB Created: 2020-12-24 07:36:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 936905b1b24e159b855891ed13df0340 SHA-1: 21ed000feef91c7d8cdc41974f563ad81088705b SHA-256: e6ac89d76660999b6fabcffb845f1b5bce8c5f9c9a9ca6462ab2858e943d6dc6
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 are to benign-looking documents, but one is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to drive traffic to external sites, potentially for phishing or malware distribution.

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://traffine.ru/123?utm_term=black+spindle+solo+guide+2018
    • https://cdn.sqhk.co/dujujema/RU2tPKL/today_s_weather_forecast_in_philadelphia.pdf
    • https://cdn.sqhk.co/munenetifu/giHRdje/3086226812.pdf
    • https://cdn.sqhk.co/wupifufexix/heiheih/italia_dance_music_appropriate_for_school.pdf
    • https://nobaditidiz.weebly.com/uploads/1/3/4/2/134235496/4965031.pdf
    • https://cdn.sqhk.co/sekeniti/biijbjb/4_row_freestall_barn.pdf
    • https://cdn.sqhk.co/pegebatanuz/gdZhbjg/cake_recipe_simple_without_egg.pdf
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/gakifuvakiveten_takojeros_gutafilusobifa_bokuvutepaxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zetare/modele_attestation_de_fin_de_stage.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/kazalibavaje.pdf
    • https://s3.amazonaws.com/jolufozo/92811500286.pdf
    • https://s3.amazonaws.com/dugibabafod/ntc_s_dictionary_of_british_slang_and_colloquial_expressions.pdf
    • https://s3.amazonaws.com/jazuravazaguz/nofubelanopemenuditela.pdf
    • https://s3.amazonaws.com/kukazowox/recipe_for_apricot_jam_chicken.pdf
    • https://www.youtube.com/watch?v=Hfwt7WxbY0sMost
    • 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_off0000df6a.bin
24b7d0d1d641d1aaac9df1db117720846db6338b948dcb7b49fea8149e881dab
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 5780 bytes
font_01_sfnt_off0000f337.bin
0d787ed6f500b6db1c44f787021900a4432959198b16e09ad962fac17dff637e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 10244 bytes