Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe921bbb5e3ca6c7…

MALICIOUS

PDF

74.4 KB Created: 2021-03-30 23:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48afbbf37664aa5be5b6348d79f602f4 SHA-1: e054edffb2e130f1c4ae04222acec33d1578006a SHA-256: fe921bbb5e3ca6c70811cf074ac792938795fc5e248638c9dc2f5792b9e908fc
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristic detections indicating it is a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'carbon copy 1099 forms', suggesting a lure for financial information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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://nipisod.ru/123?utm_term=carbon+copy+1099+forms
    • https://cdn-cms.f-static.net/uploads/4390382/normal_60540ff5d1a81.pdf
    • https://static.s123-cdn-static.com/uploads/4492892/normal_5fccc4643ce51.pdf
    • https://cdn-cms.f-static.net/uploads/4384160/normal_6056920257652.pdf
    • http://fawaxifiwuzodil.scienceontheweb.net/clinical_sports_nutrition.pdf
    • http://sesesuruko.mypressonline.com/revolution_prep_sat_reviews.pdf
    • http://fesufobototezer.mywebcommunity.org/the_art_of_styling_sentences_20_patterns_for_success.pdf
    • https://cdn-cms.f-static.net/uploads/4368492/normal_602f17f933760.pdf
    • http://fanisore.sportsontheweb.net/kiss_the_rain_piano_sheet_roblox.pdf
    • https://cdn.sqhk.co/vasibejovej/qhhImje/blasphemous_esdras_guide.pdf
    • https://cdn.sqhk.co/bipokagiti/cjcDica/oecd_beps_action_13_final_report.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nunakixuma/my_wicked_wicked_ways_sandra_cisneros_shmoop.pdf
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_df81bc138947472799877372f4c39e97.pdf?index=true
    • https://s3.amazonaws.com/sabegokek/71983219279.pdf
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_f7ecb91877394d2d980aaeee917f767b.pdf?index=true
    • http://satawakerexe.atwebpages.com/2009_ap_english_language_and_composition_synthesis_essay.pdf
    • https://a909b8fe-7c6e-4467-a5b6-92e64a2a5b5d.filesusr.com/ugd/65efca_4bc53ca26b3645dba593a30bbe40a942.pdf?index=true
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_a84c873351304c228dafaabc377bf85b.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_off0000e423.bin
617da6821a93640ae3b98fdee19a7b5a3081581d83d8124966b0bd8495fb861a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE423 5624 bytes
font_01_sfnt_off0000f738.bin
23ee386179dcc47d7208d10fd99d728d7bac0ca9bba3c58eb2e0a16e78ddd3b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 11112 bytes

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