Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b131d554f23b6d…

MALICIOUS

PDF

76.3 KB Created: 2021-03-18 04:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16d24bd34ce62a0b24b2238edb0072f7 SHA-1: 74794dd8fb8f2b6c919662face54afc5d0a18afd SHA-256: c5b131d554f23b6d474d3e54b56f31c1f367e1bbc77df555b74f706aeb2d19f9
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with the primary URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=king+size+flannel+sheets+for+sale
    • https://cdn.sqhk.co/lasumalena/ge6ghgi/numinufitom.pdf
    • http://ruwegekugite.22web.org/56823340132.pdf
    • https://cdn.sqhk.co/xonarewu/jbJDkRG/83995433525.pdf
    • https://vokewubepil.weebly.com/uploads/1/3/4/4/134443825/5113168.pdf
    • http://magnifioco.site/dj_conway_dragonsybn48.pdf
    • https://rowozone.weebly.com/uploads/1/3/2/7/132740293/bf3d22.pdf
    • http://karaulovlife.site/dell_c1765nfw_fuser9amow.pdf
    • http://menformula.xyz/android_unknown_sources_greyed_outt6wq3.pdf
    • http://creamwalls.online/what_can_you_do_with_a_public_relations_major0mm14.pdf
    • https://cdn.sqhk.co/rulopojuna/eygdjcV/stokke_tripp_trapp_5_point_harness_installation.pdf
    • http://pss77.ru/vuxumixujapimalelosogimaxdkt7c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fituguguras.rf.gd/kasutulikivux.pdf
    • https://s3.amazonaws.com/woxorojero/kekonulusigevoragu.pdf
    • https://s3.amazonaws.com/dikomavomem/27014020396.pdf
    • https://s3.amazonaws.com/jojitagifuva/17055962782.pdf
    • https://s3.amazonaws.com/jawusawar/minn_kota_ulterra_trolling_motor.pdf
    • https://s3.amazonaws.com/lixisariwulo/bepikem.pdf
    • https://s3.amazonaws.com/zoromexemuzid/airline_newsletter_template.pdf
    • https://s3.amazonaws.com/batoragubukepo/eeprom_ic_datasheet.pdf
    • https://s3.amazonaws.com/susonanezaj/envision_integrated_mathematics_2_answers.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_off0000e1dd.bin
539f98ac3cd17d20a50a174cda293a8a30f9c6f5f87eefc4ffe4ed45da1d5a9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 4836 bytes
font_01_sfnt_off0000f24b.bin
5ed7eaad2806cc38bdc836b8e8608e840400b65b8fb81a03c8d4ee1aef9ba15f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 10476 bytes
font_02_sfnt_off00011615.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 4324 bytes

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