Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e93c62b592b962e…

MALICIOUS

PDF

105.0 KB Created: 2021-03-29 07:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61d60c3851d6b747b88a9b5bf5c4a214 SHA-1: be49005d1ed57d15f1a46dd78277f5f390412644 SHA-256: 7e93c62b592b962e74a7749b01a3757a4b7c967552f576664b9b7faddfb0e3e5
176 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are part of a link farm designed to appear as legitimate content. The heuristic 'PDF_SEO_LINK_FARM' and the presence of a URL like 'https://seumenha.ru/award?keyword=adobe+acrobat+pdf+reader+update' strongly suggest a phishing attempt to trick users into downloading malicious content disguised as a software update. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://seumenha.ru/award?keyword=adobe+acrobat+pdf+reader+update
    • https://static.s123-cdn-static.com/uploads/4374519/normal_5ffc57aad7738.pdf
    • http://best-store.club/medusawevufawu9mlxk.pdf
    • http://zopesozali.mypressonline.com/bsc_ag_syllabus_2020.pdf
    • http://luchdobro.site/pandemic_meaning_in_marathi_translationytq65.pdf
    • https://cdn-cms.f-static.net/uploads/4375528/normal_60601cca2200f.pdf
    • https://cdn-cms.f-static.net/uploads/4480399/normal_600c736b8dff4.pdf
    • https://cdn-cms.f-static.net/uploads/4374177/normal_6027a74d8e255.pdf
    • https://cdn-cms.f-static.net/uploads/4453532/normal_6052b7b1a65b9.pdf
    • https://cdn-cms.f-static.net/uploads/4496151/normal_5fe6fbeacb3ba.pdf
    • https://cdn-cms.f-static.net/uploads/4378386/normal_60564fdc7ad65.pdf
    • http://kasaxeko.mypressonline.com/derechos_humanos_en_estados_unidos_de_america.pdf
    • http://fosireditoj.mygamesonline.org/how_to_power_pedals.pdf
    • https://cdn-cms.f-static.net/uploads/4369772/normal_601d9572f3911.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_211760db578a40ef91fec32dc6e6b610.pdf?index=true
    • http://pofijiserige.onlinewebshop.net/travel_agency_marketing_plan.pdf
    • http://fanalejowegop.atwebpages.com/ciencia_definicion.pdf
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_b817faaa1d0b4827b6e97c44dde06308.pdf?index=true
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_b07b5d59a3294c43b889cbe5aed81fd7.pdf?index=true
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_c74b690dc0e147759957d24bb1afbca1.pdf?index=true
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_700e5487cfb3434b87facd9cc07b7038.pdf?index=true
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_6899efe9c63248b29a3cec84147686a5.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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000141a4.bin
d666714aaf4aa4bbe080dd28eddb3d51e070b98f5b5a626cbea7ad5af643d893		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x141A4 15152 bytes
font_00_sfnt_off00013061.bin
2734fe386af93633c7916c6d343c48e0580aeb20e95a3867e6a7a5a4e48457df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13061 5068 bytes
font_02_sfnt_off00016b31.bin
5213e1532ff9afa99ca7579eb49cd30cd4bb4d9bbc87fe6900ca2905a997783a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B31 11828 bytes

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