Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11d94b458011ed6…

MALICIOUS

PDF

76.6 KB Created: 2021-03-19 11:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b6657cc7047efc4ac5f9565d6587f08 SHA-1: d4db4051405ebd1a7608492841290145a1bb4043 SHA-256: f11d94b458011ed6d0dabf76719035912400685bb566d65e862dbf19d2b870ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains a large number of external links, indicating a potential link farm or phishing attempt. The document body, though heavily obfuscated, suggests a lure related to 'worksheet answers', which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/wix?keyword=classical+or+operant+conditioning+worksheet+answers
    • http://lorakuze.sportsontheweb.net/zagg_slim_book_go_keyboard_case_for_ipad_pro_11.pdf
    • http://ravasixojodari.mygamesonline.org/what_fuel_does_a_stihl_blower_use.pdf
    • http://adr-media.work/princeton_review_math_gre3sejs.pdf
    • http://lishop.site/does_samsung_tablet_use_windowsztg47.pdf
    • http://dektesheff.xyz/do_you_need_a_deed_to_sell_land8oawj.pdf
    • http://save50.pro/el_libro_de_jaser_parte_ii3s1kh.pdf
    • http://vitrinachel.ru/47909889022z5ncc.pdf
    • http://devivitonewe.sportsontheweb.net/6994920054.pdf
    • http://jixewelo.scienceontheweb.net/61600081076.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_6e527c4302074f4490f593995228f249.pdf?index=true
    • https://c948e902-2437-43f3-9f1e-7aaad30688a7.filesusr.com/ugd/464a75_f2a4dd08fca54564a0ceb220ba0b3a4d.pdf?index=true
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_f6cfd8993a9844048cc46fb88fcf41d1.pdf?index=true
    • http://samesesodore.onlinewebshop.net/tadukojafobisitevafu.pdf
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_cabbb55f08894dc4929ed727aa4df741.pdf?index=true
    • https://s3.amazonaws.com/suxuzubojut/google_account_manager_apk_6.pdf
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_3643f981be83411289f784234aeeb1db.pdf?index=true
    • https://s3.amazonaws.com/wukevirenesu/65300709438.pdf
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_8fd7dd50eded4384a5a0a3d75bb0d1e7.pdf?index=true
    • https://s3.amazonaws.com/rewepalazamiso/49367532092.pdf
    • https://s3.amazonaws.com/mefadedosuw/mezaxadalibafuber.pdf
    • https://60b161a2-b511-46bc-b48c-7ca4331f2db3.filesusr.com/ugd/34b71b_3ea1bef068f04cc7b43fb099dbb40649.pdf?index=true
    • https://s3.amazonaws.com/satuja/god_of_war_1_playstation_game.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_off0000e185.bin
e8e0c3f8d764b4c5d883767085d4b405768b9361aa8b0cbc767e0760f8a7f8c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 5300 bytes
font_01_sfnt_off0000f393.bin
80ad7d6da48448ca3d35e6b8eda3e584bd7da7794c74fe0c1f47a3e49dcb4fe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 10248 bytes
font_02_sfnt_off0001169e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1169E 4324 bytes

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