Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e0227fceebd2c0…

MALICIOUS

PDF

83.6 KB Created: 2021-03-29 09:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd6dc7665a6d8c9309a6e3d265c05968 SHA-1: d51d31150b57c904f7b825e3cffd88294b179560 SHA-256: b7e0227fceebd2c0be436e3ce625c1f13a2d87016b4f1d03846c0e636fe42d72
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are hosted on disposable domains or file-sharing services, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains keywords related to game hacks, indicating a lure to attract users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://pelibifir.ru/wix?keyword=gems+hack+apk+for+clash+of+clans
    • https://velonifiwivuli.weebly.com/uploads/1/3/0/7/130739758/4d714e8cb23cfe.pdf
    • https://momimuraw.weebly.com/uploads/1/3/1/3/131384495/zuwus_kemakonatexe_pawaz_renokowopo.pdf
    • http://zdorovienashevse.xyz/8200232231s13o6.pdf
    • http://rastet-malysh.ru/ipad_mini_5_price_in_india_amazon1ug0h.pdf
    • https://tefizaset.weebly.com/uploads/1/3/4/5/134587169/vafetivuvekazuki.pdf
    • http://megantv.site/does_firehouse_subs_offer_gluten_free_bread07ico.pdf
    • https://nabivedoki.weebly.com/uploads/1/3/1/4/131407492/4382807.pdf
    • http://karma-911.com/weber_smokey_mountain_grill_modyjkcj.pdf
    • https://nenawopoweso.weebly.com/uploads/1/3/1/4/131406478/duweweganez-relujutujapetiw-torumugujizin.pdf
    • https://razixaluzelel.weebly.com/uploads/1/3/4/8/134857706/tutebovevudin.pdf
    • https://lesofetu.weebly.com/uploads/1/3/1/3/131378838/4023362.pdf
    • https://kozitasulama.weebly.com/uploads/1/3/4/6/134647404/693c4de5544cb.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_773cd3331f384b71a0bd1f478545bfbe.pdf?index=true
    • https://s3.amazonaws.com/pobixedele/algorithm_design_and_applications_goodrich_solutions.pdf
    • https://s3.amazonaws.com/tezofuretejom/thin_lizzy_sugar_blues_live.pdf
    • https://uploads.strikinglycdn.com/files/26d83c22-bf00-4aed-b2ec-3a1bc1b0000d/simejisufezodaf.pdf
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_c7b2ca417ad84e7596e3bb7813ef543a.pdf?index=true
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_c384c96d653940d89f860e89c063f656.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bff03cbf-5f9c-478c-9738-6be91dfa9d12/chemistry_12_reaction_mechanism_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/f993df63-383d-4649-9e61-84982ca0452e/final_walkthrough_before_closing_on_new_construction.pdf
    • https://s3.amazonaws.com/kitakilesa/wisagikexuxalulafiwarag.pdf
    • https://s3.amazonaws.com/mojivikapeti/jusemisinalawaf.pdf
    • https://uploads.strikinglycdn.com/files/af829f14-3f5b-4e39-9216-00639e452b47/77567903569.pdf
    • https://uploads.strikinglycdn.com/files/1480e4fe-8415-4b3e-adb1-cfde1e88ae02/quotes_from_shatter_me_series.pdf
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_a14412314f714dcda3422e3791665a25.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_off000109df.bin
5f8ccd223b1cd7ffb66104730aa91ad8a8cd4a36979d937349e25aaac5b293eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 5352 bytes
font_01_sfnt_off00011be7.bin
dc3531543c3356ef95f075eb96b8c5f7a6b0c4b143b772ea689c8152c546c532		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE7 10772 bytes

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