Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2dee01ef7cb0d3…

MALICIOUS

PDF

84.3 KB Created: 2021-03-19 18:12:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 962f693ad29652c031c52bc918c3012f SHA-1: 4a2b2da56bb7b8fb4a5dfc375711227062d30895 SHA-256: 7f2dee01ef7cb0d3828cf82db4a7bc919a91732f1f30ecbd1dcab8981507be14
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though truncated and obfuscated, contains text suggesting it's an 'Email template for requesting information', which is a common lure for phishing. The presence of numerous external URIs, including one pointing to 'dafemum.ru', strongly suggests the document is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=email+template+for+requesting+information
    • http://pimawusi.22web.org/woolf_a_room_of_one_s_own.pdf
    • http://jakusavu.sportsontheweb.net/paxilozare.pdf
    • http://fajasated.mywebcommunity.org/line_6_firehawk_1500_pedal.pdf
    • http://pixunune.sportsontheweb.net/3925391938.pdf
    • http://vuzetasavuxoso.mygamesonline.org/lesion_axonal_difusa_2020.pdf
    • http://newuwedeza.mypressonline.com/21574909235.pdf
    • http://jefevivavifax.scienceontheweb.net/how_to_turn_on_sole_f60_treadmill.pdf
    • https://cdn.sqhk.co/tijatabov/jbia6ie/cfo_salary_range_uk.pdf
    • http://zogometemo.sportsontheweb.net/dumururetolametemowu.pdf
    • https://cdn.sqhk.co/pupevadojas/Amihjah/49438013978.pdf
    • http://vebifitapex.mypressonline.com/1923285559.pdf
    • https://zesalogerevuj.weebly.com/uploads/1/3/4/6/134684883/3024460.pdf
    • https://cdn.sqhk.co/zasokolof/VK7ggHk/70_80_90_music_hits_radio.pdf
    • https://cdn.sqhk.co/letarezetap/CKsihKb/40504930244.pdf
    • https://cdn.sqhk.co/rebamomidaw/LqXThdI/police_chase_games_for_android.pdf
    • https://farazekij.weebly.com/uploads/1/3/4/3/134379469/ff327.pdf
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/407543.pdf
    • http://gixipures.sportsontheweb.net/aiag_cqi_14.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xajizufobuvofo.epizy.com/78661812998.pdf
    • http://tafiwepamubov.atwebpages.com/16015412335.pdf
    • http://fosixokosed.rf.gd/21932124690.pdf
    • https://uploads.strikinglycdn.com/files/c866fd40-8676-4153-b7d0-61bf91a77f55/norse_mythology_books_for_young_adults.pdf
    • https://uploads.strikinglycdn.com/files/d02ddd3f-f08b-4ca3-8165-ee64c8d4d7fc/52047462678.pdf
    • https://uploads.strikinglycdn.com/files/6f0b85df-9a91-4d2b-a303-62d3657a2322/65444540283.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_off00010bb4.bin
28b1e15095d83327502bb773f8a7bcf6bd21d77a70927ca3d87f491f1306a8ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 5304 bytes
font_01_sfnt_off00011da8.bin
1d99cf49d20c2f3fafac7013c37034f26b5e2fa2df6c4ff8ad74919b5200d62b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 11104 bytes

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