Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8380272fb249dd5…

MALICIOUS

PDF

78.9 KB Created: 2021-03-25 03:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef01f9031c24a61419f60f71c81c31a0 SHA-1: 1c7c19298f710f3f53ef30e99402cb72d8da88e7 SHA-256: c8380272fb249dd5bcef458fb15fa4c28eb2716bea9fe57fd05d277f72508222
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure itself are indicative of malicious activity, likely to redirect users to compromised or malicious sites.

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-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://midufefew.ru/wix?keyword=tour+guide+flags
    • https://tenasedoba.weebly.com/uploads/1/3/4/3/134333827/067107859e32.pdf
    • https://lareduna.weebly.com/uploads/1/3/1/4/131453109/8605842.pdf
    • http://xanevejesofag.mygamesonline.org/programming_arm_cortex_m4_tm4c123g_with_c.pdf
    • http://mebevevi.mywebcommunity.org/95367023325.pdf
    • http://mumopajikex.mygamesonline.org/what_is_network_and_types_of_network.pdf
    • http://zovofuti.mygamesonline.org/ilive_bluetooth_speaker_system.pdf
    • http://pofuxubilet.sportsontheweb.net/16.1_our_dynamic_climate_key_concepts_answers.pdf
    • https://vewejefimubi.weebly.com/uploads/1/3/4/1/134108794/daxesajurirosopef.pdf
    • http://kurutog.mygamesonline.org/20020784054.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_2dda74fe229a459789cf09eb096368db.pdf?index=true
    • https://0c7b1e5d-10e9-4c66-9a64-57e6babc74f3.filesusr.com/ugd/6b59ba_d7e014549d4c465d91447d2863163b60.pdf?index=true
    • https://s3.amazonaws.com/zifozujiwi/aiims_jodhpur_ldc_recruitment_2019_answer_key.pdf
    • https://s3.amazonaws.com/mutirexa/17802083437.pdf
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_88963f306d194db7ac0882e0ce3454c3.pdf?index=true
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_166f5754aa2748e9b980a7cc71bb8c08.pdf?index=true
    • https://s3.amazonaws.com/feborobegibew/attendance_certificate_template_free.pdf
    • https://s3.amazonaws.com/tamovagag/rupukisuzob.pdf
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_a78dcd25d2434086b0db3d085df72d97.pdf?index=true
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_7d3124b27a204596a39c21fbad34c57a.pdf?index=true
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_fa643e8c94174e45804bb37a1a51ff5c.pdf?index=true
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_ddedd7aa95da4068a2b5a48c262fa977.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_off0000f803.bin
91a058ec18345a59c39377d0dc50d7876f983418ecab6bbb2852e7218e59b052		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 5024 bytes
font_01_sfnt_off00010929.bin
b953e376e50f1f599c9e6bdb2543a27c3aba92a4f826782e376019f544b3331d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10929 11076 bytes

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