Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79f28fa4076db23…

MALICIOUS

PDF

82.4 KB Created: 2021-03-31 22:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85b12ab900e10c5df1774fac76c88efb SHA-1: 71ed37b27c45dbe29e6c630355dacdc0305a5219 SHA-256: a79f28fa4076db2337aad97f3dfe54df27729777d1ad1ebf74c0c3fe66fb61ce
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://kuzutuzo.ru/award?keyword=bandit+queen+book+pdf
    • https://cdn.sqhk.co/reriwoduriju/8hhfugf/98800666571.pdf
    • http://riwuveroxuwox.66ghz.com/12671216948.pdf
    • https://cdn.sqhk.co/duxadikoti/KaThagh/instagram_captions_and_quotes_2020_baddie.pdf
    • https://cdn.sqhk.co/vinikawikuve/gejgKib/free_vocabulary_printable_worksheets.pdf
    • http://opensalon.xyz/12011235219ttyk7.pdf
    • https://cdn.sqhk.co/novigigexuxo/1tjjjfk/turbo_card_reload_time.pdf
    • https://tunoworuv.weebly.com/uploads/1/3/4/0/134017870/widena-gajizilumazel-kujifijibap.pdf
    • https://tujazewus.weebly.com/uploads/1/3/6/0/136028127/zuvuser-wejabe.pdf
    • https://cdn.sqhk.co/sefibenip/cjLfNhd/appdynamics_apm_peak_pricing.pdf
    • https://xunopigiwigon.weebly.com/uploads/1/3/1/6/131636761/lizexefoninurab-wukoj-witerutujuvi.pdf
    • http://cetakchantek.com/android_version_9_samsung_s8v6r70.pdf
    • http://getdouche.xyz/garrett_ace_250_metal_detector_best_priceqg3vy.pdf
    • https://voxisazemiruza.weebly.com/uploads/1/3/1/8/131871554/2518930.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c4289c84-3645-4a63-8b42-d7aaafa1a2e3/samsung_galaxy_s4_mini_extended_battery.pdf
    • https://uploads.strikinglycdn.com/files/dc18b4d5-6f79-402a-b60e-3e38f50203f6/what_does_the_navy_seal_training_consist_of.pdf
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_97d5e84d1c9e4988b41291fd27351e78.pdf?index=true
    • http://wawefib.rf.gd/cool_jobs_wide_world_of_robots_answers.pdf
    • https://uploads.strikinglycdn.com/files/1fa392d1-32c8-4cca-8592-3399ab05007f/fanuc_macro_programming_examples.pdf
    • https://uploads.strikinglycdn.com/files/a3940f3e-d99f-48b2-a33b-a5856b6c4912/how_to_draw_a_tree_house_easy.pdf
    • https://uploads.strikinglycdn.com/files/8d63a683-7a86-44c5-a8a2-3481124b544f/petty_and_cacioppo_study.pdf
    • http://didabatok.epizy.com/third_conditional_exercises_autoenglish.pdf
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_4cae04eeb2e64432b1e251b81094b860.pdf?index=true
    • 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_off00010468.bin
f26d6d34e50ac2bd72d57133fc7575f79ec3d68cdabde9fafb79cfd07c1abb42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 5108 bytes
font_01_sfnt_off000115dd.bin
160bb615995019c323949964d4b8e7c2b3a3efb4a230b9f16656681ad5afc8f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115DD 10940 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.