Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0bb29d6d89b812d…

MALICIOUS

PDF

75.2 KB Created: 2021-05-19 08:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3abf47a6b8a43effac402b1190bef61c SHA-1: 71408468ba3c5274694ac338ffd4895a6e3d9cf2 SHA-256: a0bb29d6d89b812d24f7953436b67e65c4206698457c8cb89f76b0724909eb4d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with the primary heuristic identifying it as a link farm. One of the external URLs, 'https://ponafet.ru/strik?utm_term=is+google+making+us+stupid+nicholas+carr+analysis', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse.

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://ponafet.ru/strik?utm_term=is+google+making+us+stupid+nicholas+carr+analysis
    • https://dotuxebi.weebly.com/uploads/1/3/1/4/131454754/posebofigi_seguwa_mijak.pdf
    • https://static.s123-cdn-static.com/uploads/4501963/normal_60026e071ac6c.pdf
    • https://kukurako.weebly.com/uploads/1/3/5/3/135321284/2763249.pdf
    • https://static.s123-cdn-static.com/uploads/4380858/normal_600114debab90.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bb1e7742-bf88-40ec-bc11-2a27bd13657e/how_to_manage_stressors.pdf
    • https://uploads.strikinglycdn.com/files/6cacde3d-14b9-4656-89bc-cf25af0740be/bebup.pdf
    • https://uploads.strikinglycdn.com/files/cafbeae8-d6fd-40f2-a94a-90a294da7597/ridagazigagenito.pdf
    • https://uploads.strikinglycdn.com/files/6aacf6c5-4829-4405-acbe-9a15ac30787a/gmat_official_guide_2020_ebook_free_download.pdf
    • https://uploads.strikinglycdn.com/files/f4d1db5e-e1cc-4e05-be36-cfb6f16f986c/49666728322.pdf
    • https://uploads.strikinglycdn.com/files/7c44dee8-6c8d-4321-b8e4-d8e8912472a5/black_and_decker_hedge_trimmer_replacement_power_cord.pdf
    • https://uploads.strikinglycdn.com/files/238219df-ffd5-43e7-b43e-f29a81e8d932/millermatic_130_auto_arc.pdf
    • https://uploads.strikinglycdn.com/files/5171802a-61df-4e23-a366-93f06499f157/how_do_i_cancel_my_washington_post_subscription.pdf
    • https://uploads.strikinglycdn.com/files/8a468ea6-9cd2-4912-b394-81bd4c052a64/35260773940.pdf
    • https://uploads.strikinglycdn.com/files/d929e0c0-c4f9-44c5-b24a-0669a9565bc0/save_the_cat_beat_sheet_movie_example.pdf
    • https://uploads.strikinglycdn.com/files/a5d15797-f5e7-40c7-a19c-8cbdc4c7d719/mightier_than_the_sword_meaning.pdf
    • https://uploads.strikinglycdn.com/files/46f55bee-eb88-44f4-8b41-ac97f5836d74/le_petit_prince_chapter_6_summary.pdf
    • https://uploads.strikinglycdn.com/files/e0b5b225-5324-4d0d-b584-fe2dddb36bc0/why_isnt_my_wahl_clippers_not_cutting.pdf
    • https://uploads.strikinglycdn.com/files/9e476b3c-bd90-4cd0-b68d-61707086d539/what_is_chapter_1_about_in_the_great_gatsby.pdf
    • https://uploads.strikinglycdn.com/files/0e7cdfb4-4248-49b4-b06a-bee7e68dd549/how_to_hard_reset_a_moto_phone.pdf
    • https://uploads.strikinglycdn.com/files/6681c0a9-7223-46ee-a6cc-6663e3fce356/wabage.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b3.bin
11b849ad03dcb9a84e1029a71c3cc3b19298905e17dcc4062d0d9520ca57d709
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 5592 bytes
font_01_sfnt_off0000f899.bin
aefaa323643c54c9491cafd4ebf9585ac4031b649bb4397c25489239af9c3aba
pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 10816 bytes