Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1fb930c9785d22…

MALICIOUS

PDF

70.2 KB Created: 2021-03-10 10:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 771b30dd57305ec510f8d13b8d3c14d6 SHA-1: 54c0aae5b152804ced237f8c64778cebd1ab5490 SHA-256: af1fb930c9785d22b9aa587734f4f6b661b4754b9e9da2d8cf03edf94326477c
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 heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely to facilitate phishing or malware distribution. The embedded URL 'https://golowaki.ru/aws?utm_term=nick+hornby+high+fidelity+audio+book' is a primary indicator of this malicious activity.

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://golowaki.ru/aws?utm_term=nick+hornby+high+fidelity+audio+book
    • http://gallery-shop.site/gosiderilosipoxowii9rfi.pdf
    • http://pogadai.xyz/tuxuzojemabax3o7np.pdf
    • http://kijofizovurisos.medianewsonline.com/pugatoworixum.pdf
    • https://degexaxi.weebly.com/uploads/1/3/1/4/131406510/dufedazi.pdf
    • http://beach-fruit.fun/saworivejxndmy.pdf
    • https://wonelapafilujol.weebly.com/uploads/1/3/1/6/131606162/vojulawaw_gawarinutujikub_sujux_vopujejepagoge.pdf
    • http://nelawetazabuta.66ghz.com/34677552462.pdf
    • http://kmplitka.shop/manhattan_prep_gre_set_of_8_strategy_guides_manhattan_prep_gre_strategy_guides_paperbackfwet4.pdf
    • https://dakuwiremab.weebly.com/uploads/1/3/4/9/134901294/b0a20bf0bf6.pdf
    • http://dilawiputonu.mypressonline.com/devi_bhagavatam_sanskrit_and_english.pdf
    • http://changely.club/accuair_e_level_plus_touchpad8jgj2.pdf
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/4101535.pdf
    • http://supariwepexafat.mywebcommunity.org/dunkin_donuts_protein_bowl_nutrition_facts.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_de095ff9cf804a0ba6056877127429d0.pdf?index=true
    • http://gasigigi.rf.gd/zunurivab.pdf
    • https://uploads.strikinglycdn.com/files/79b727a5-26ab-4888-a1fd-7ae221117589/do_wired_xbox_one_controllers_work_on_360.pdf
    • http://kuxoxokazutuv.myartsonline.com/xifuwawixodopuxizaganubid.pdf
    • https://uploads.strikinglycdn.com/files/21420d5e-712c-4396-bcb0-55cc6266269f/15323009767.pdf
    • http://moxevigevawoko.epizy.com/guide_du_routard_prague_vienne_budapest.pdf
    • https://77cfc6c3-2cf4-4abe-bdec-bf05e106f391.filesusr.com/ugd/1d3654_95091b3fe3ff42068417d00e4389bea0.pdf?index=true
    • http://towilisok.epizy.com/conair_clipper_guards_2_inch.pdf
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_98606f5224df4ab9bc470dff1307de9d.pdf?index=true
    • http://samajusinifako.atwebpages.com/pefuputegikepo.pdf
    • https://uploads.strikinglycdn.com/files/8e277b99-53a1-4b52-b4f2-4ab2e6fe1433/nikon_af-p_dx_18-55mm_lens_review.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_off0000d3ab.bin
b6936c01ba2caa203648b34ff58e11f8490b3d168df4f76dad089f53b84803bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AB 5380 bytes
font_01_sfnt_off0000e605.bin
71164fb5d9ab3604c4a8f0af79cfbd76c882e230c60bbfcbdedbff17e9881ea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 10456 bytes

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