Malicious PDF — malware analysis report

Static analysis result for SHA-256 6048a5ef0b147cb2…

MALICIOUS

PDF

80.0 KB Created: 2021-03-20 16:52:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c10b527510b03711bcd8ce903c5e0754 SHA-1: 5ce9850db084eae33ffc1792ecfcca36b91db118 SHA-256: 6048a5ef0b147cb26fd92e80e139ddbbb2773fb6e30557caa2aa59989e1273cb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/aws?utm_term=father+and+son+gosse+summary
    • https://gosalojuwik.weebly.com/uploads/1/3/6/0/136050429/f4fc8735637c.pdf
    • https://cdn.sqhk.co/jijatidos/bCBDhfh/rolling_ball_obstacle_course_game.pdf
    • http://suberubepuparo.getenjoyment.net/76862133898.pdf
    • https://static.s123-cdn-static.com/uploads/4390381/normal_5fec19d35ec14.pdf
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/8914841.pdf
    • https://zisediri.weebly.com/uploads/1/3/1/4/131411341/e6d864ed14ecc1.pdf
    • https://cdn.sqhk.co/mavixuwaloz/srBjahk/party_city_promo_code_oct_2020.pdf
    • http://fafijitesulexiz.mygamesonline.org/amnsie_globale_transitoire.pdf
    • https://cdn.sqhk.co/putuziboki/ifeFgdg/88594003693.pdf
    • https://cdn.sqhk.co/wamiratena/NjdOied/need_for_speed_no_limits_mod_apk_ios.pdf
    • https://cdn.sqhk.co/nuwalimo/c4aWSia/download_soldier_shooter_jump_and_run_mod_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4379855/normal_5fc75bba371be.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/goviwigax/bhojpuri_video_hd_ing_gana.pdf
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_39ed27eaa911484c8d7806c8e503a96b.pdf?index=true
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_12b2943dafbd463882d27c795479773c.pdf?index=true
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_76f355972e794920a824210e7704d5fe.pdf?index=true
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_dd6e95baa67141fb8fa0815f1102e832.pdf?index=true
    • http://vobozezojip.onlinewebshop.net/how_to_set_time_on_casio_g_shock_ga-100b.pdf
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_46f8ce40aa4540938db18fe3d1c7a233.pdf?index=true
    • https://s3.amazonaws.com/rawesaragegugar/18207283642.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_off0000ecdd.bin
310a223ef2a2b63b3d65ae6c8de4d7cea201a723e82b0254168074723d8fad9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 5100 bytes
font_01_sfnt_off0000fe0c.bin
0e99885573199917fb3718a91d944cc94a8bb1bcfee34235c421e049304a03a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0C 10960 bytes
font_02_sfnt_off00012300.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12300 4324 bytes

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