Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1b1940b25d6eee…

MALICIOUS

PDF

78.5 KB Created: 2021-04-05 05:39:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 186441b1d49c16d5db18119703499d67 SHA-1: 9494fa93d9c7967b0af8574c0efecce1b45cc444 SHA-256: ab1b1940b25d6eee4d329288447cb5e2aa2868a5796a2dfe017bc31526c32850
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 disguised as benign documents, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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://golowaki.ru/123?utm_term=weekly+calendar+template+printable+2018
    • https://cdn.sqhk.co/moturira/eOwhgqn/jorumumelosuzojateked.pdf
    • http://lezeninimi.medianewsonline.com/ukulele_easy_songs_hindi.pdf
    • https://cdn.sqhk.co/feletitami/z3kjf7H/constellation_software_annual_report.pdf
    • https://cdn.sqhk.co/wugunifikezu/kjbibWE/xogijegiwawinobekadiku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_5f14991d5bc9433b9475d698825d4a50.pdf?index=true
    • https://uploads.strikinglycdn.com/files/341464ab-4fab-488a-bbb5-588f133f8378/forgotten_realms_dwarf_clan_names.pdf
    • https://uploads.strikinglycdn.com/files/6a8c046b-9c83-419c-aa68-68ca4aed96b3/types_of_organizational_structures_in_writing.pdf
    • http://vedixemalirugi.atwebpages.com/how_to_connect_my_canon_printer_to_my_computer.pdf
    • https://uploads.strikinglycdn.com/files/5d636922-f2ff-4a0d-95b3-5bdb8d7fe555/50309671242.pdf
    • http://vakogez.myartsonline.com/the_secret_life_of_pets_2_chloe.pdf
    • https://s3.amazonaws.com/rizijubovapuk/8th_grade_social_studies_staar_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/0ef3cb09-8d62-49fd-8ccd-930e61ca5f9e/sewing_for_beginners_book_uk.pdf
    • https://uploads.strikinglycdn.com/files/30783866-033f-4ae6-a3a5-cfade8a3482a/how_long_is_war_and_peace_words.pdf
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_d2da1e3de9774ee680dc5a407b58b147.pdf?index=true
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_d4cd204661f2409ba77d9902d6c69d0a.pdf?index=true
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_2ce753fe23284ceeac298c9c412078f7.pdf?index=true
    • https://s3.amazonaws.com/tofizo/wowisami.pdf
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_f91258d0c89e4761b7b0d0de00d2044a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b06e793d-616f-493b-b3c9-cc79c84af6d3/nisevejitaderufe.pdf
    • https://uploads.strikinglycdn.com/files/e8356e5a-afc5-4373-b8fa-93fe208aee81/best_way_to_study_the_bible_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/1ce89ae7-cb57-4159-903f-f004de7f6dbd/how_to_find_horizontal_asymptotes_for_a_function.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_off0000e999.bin
c996d9398cfc15bdaf2e9a42faf502a3cd65294cd8060cbf28b288089b175cd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 5556 bytes
font_01_sfnt_off0000fc72.bin
648827f0bb94e5fbf30a324105e0dac0fec33576b677906e73baa1899bf3f2ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 9884 bytes
font_02_sfnt_off00011e48.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E48 4324 bytes

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