Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d75575667ea958…

MALICIOUS

PDF

92.9 KB Created: 2021-03-22 17:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f241e1d232140f999315adbea42d20e5 SHA-1: b74ba7e4dabda65b0c5088cd8a64c1acd89d8036 SHA-256: 70d75575667ea958803c55267edce548fc841421ef9766b9d0c774e82c9bdb02
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common technique for distributing malicious content or conducting phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/strik?utm_term=can+you+return+open+box+to+home+depot
    • https://cdn-cms.f-static.net/uploads/4529780/normal_604a72f51e3b8.pdf
    • https://cdn.sqhk.co/lasanamemego/gcherWp/xotelobamefinedaratada.pdf
    • https://cdn-cms.f-static.net/uploads/4485572/normal_601afc8e6cd9a.pdf
    • https://cdn.sqhk.co/fogunivugame/cN4hfhb/43045916665.pdf
    • https://cdn.sqhk.co/wagomito/whe87nK/r-_type_3_snes_rom_download.pdf
    • https://cdn.sqhk.co/vutexexukus/gcdTK73/89030078001.pdf
    • https://cdn.sqhk.co/sunomedude/bBSBViI/potanovogasofanetabofe.pdf
    • https://cdn.sqhk.co/lewulula/ckBTieF/zephyr_stock_exchange_board_game_online.pdf
    • https://cdn.sqhk.co/kuwusemob/Cnjdbf2/international_marketing_notes.pdf
    • https://cdn-cms.f-static.net/uploads/4447878/normal_6011d6582ff96.pdf
    • https://cdn.sqhk.co/pigevikuwi/bgIggjd/smash_hits_magazine_font.pdf
    • https://cdn.sqhk.co/totarujined/Udjchbu/29046820315.pdf
    • https://cdn.sqhk.co/tedigedubemi/iiq2RyD/kalaril.pdf
    • https://cdn.sqhk.co/remigalakefo/ihhjgji/transitional_words_and_phrases_answer_key.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_117fbbbb0aec4cb291887b319e1fe3e9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0b8ded96-25ce-4279-a66e-a516aa8a8bdb/72275218360.pdf
    • https://uploads.strikinglycdn.com/files/c0a90ff3-04a9-495c-97ca-dd011d9e8888/vazazopowodozava.pdf
    • https://uploads.strikinglycdn.com/files/d20d6528-38d6-4ea4-a4f4-f0b6884aa2e0/dabolibasareximo.pdf
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_d8b87c373887459ca983f092f256e141.pdf?index=true
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_22a8ef1818984098abd88166f1d6cdbb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d5464075-8796-4b17-8cde-046754fe48ac/damajofarowofowowajizima.pdf
    • https://uploads.strikinglycdn.com/files/64da6b48-3b3a-43b7-95db-a38280b7f88b/are_german_shorthaired_pointers_cuddly.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_off00011f58.bin
211f57655409d0c81ca8104fdec61d055ffc071025c3f2d897e020ca046f916d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F58 5156 bytes
font_01_sfnt_off000130b7.bin
3e9fbcee6185802f4ad8ef2d2b8c3beee1ab9f46f823da10733cde9cceb9d6ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130B7 11708 bytes
font_02_sfnt_off0001584b.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1584B 4324 bytes

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