Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33f6924f1d5da68…

MALICIOUS

PDF

84.4 KB Created: 2021-03-21 09:34:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9a3a19773730b1c10099876d30aab84 SHA-1: ddb760478db7c79683bc56acddb8b52044420436 SHA-256: a33f6924f1d5da68ad87486a0b00ff3f3f24c94af6827eadcbc58b0142e1e705
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The primary malicious URL, 'https://dafemum.ru/strik?utm_term=how+to+reset+white+rodgers+1f78+thermostat', suggests a phishing or scam attempt disguised as technical information. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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/strik?utm_term=how+to+reset+white+rodgers+1f78+thermostat
    • http://seplafond.xyz/2294465863xylzy.pdf
    • https://cdn-cms.f-static.net/uploads/4471969/normal_604735badcbf3.pdf
    • http://autocredit.moscow/dixie_chopper_xcaliber_3366_specs3szwr.pdf
    • https://cdn-cms.f-static.net/uploads/4415073/normal_5fe78c197d6f7.pdf
    • http://monstergym.ru/82937830251b9bgg.pdf
    • https://cdn-cms.f-static.net/uploads/4379489/normal_600cc1c0a6a1d.pdf
    • http://rigeduvutenis.22web.org/sozebabogeguje.pdf
    • http://instapriz365.site/77819476561ivf22.pdf
    • http://icily.xyz/five_night_freddy_apk_gratisu95i2.pdf
    • http://momentshop.space/renabozri4.pdf
    • http://50offit.pro/42070582883mceqb.pdf
    • http://reliables.ru/dr_seuss_green_eggs_and_ham_book_lyricse4e34.pdf
    • http://smartbright.club/starfinder_flip_mat_downloadmaave.pdf
    • https://cdn-cms.f-static.net/uploads/4415308/normal_602e62340dd06.pdf
    • https://cdn-cms.f-static.net/uploads/4419204/normal_603d3bdea1c0f.pdf
    • http://moneymaya.site/top_10_country_songs_of_all_time_playlistm9dqp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/be088c43-3b9a-4605-a784-45d2eab41052/58727195839.pdf
    • https://uploads.strikinglycdn.com/files/1337d07a-5f7a-48e5-a918-9280a863fce2/honda_civic_hybrid_2006_oil_type.pdf
    • http://mupowazige.rf.gd/willy_the_sparrow_movie_online.pdf
    • https://uploads.strikinglycdn.com/files/471c35a6-3f99-42d0-bc28-39b15ac57f6a/brother_electronic_knitting_machine_patterns.pdf
    • http://levuras.epizy.com/52346762521.pdf
    • http://nosunep.epizy.com/how_long_is_a_p90x_workout_session.pdf
    • http://zuniguvip.epizy.com/31746807958.pdf
    • https://s3.amazonaws.com/fezenur/kenwood_ddx470_manual_espaol.pdf
    • https://s3.amazonaws.com/bovenotojitowe/52988366263.pdf
    • https://uploads.strikinglycdn.com/files/08430f44-94e6-42bc-8b2c-472828cf77fb/thinkorswim_platform_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/5cc738e4-3967-4ad8-be59-674c5891bf1e/how_to_calculate_interest_payments_on_a_loan.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_off000108ac.bin
a20684480ea5cc3a8504742e33efd0e8ec27ca7bf0efaa4defb0d32d25179f77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 5668 bytes
font_01_sfnt_off00011be6.bin
23dd60f8c7bb2e7af01942407fb1be7c898127fd4b69cad3da979a4a21c654c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE6 11892 bytes

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