Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf78c30f7193ad80…

MALICIOUS

PDF

78.3 KB Created: 2021-03-28 17:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bc7e7100aa86711a6da116222b85ac13 SHA-1: c8e81f49a7eb0905fde5341ccc980e39669a8976 SHA-256: bf78c30f7193ad8081ba65c897605d14acb693944081c7b350567f7476a0a7a7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a common search query to encourage user interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=how+long+to+cook+a+turkey+in+a+butterball+air+fryer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473388/normal_602a1bead8dde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_60335958228b2.pdfIn PDF document text
    • http://myfirstsite.xyz/zisowakanefosumzl34o.pdfIn PDF document text
    • http://familyit.pro/test_data_management_jobs_in_punelq82y.pdfIn PDF document text
    • http://cardio-active.site/moneygram_locations_in_appleton_wi1wf5g.pdfIn PDF document text
    • http://6gusevshop.website/sogujabuvisuzitofiretesqs2s.pdfIn PDF document text
    • http://coupons2020.info/moto_g6_plus_price_ukciifj.pdfIn PDF document text
    • http://finansi-7.online/o_l_c_ka_full_form3bp3w.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/jiradet.pdfIn PDF document text
    • http://italysummer.fun/fifty_shades_freed_final_clip__trailer_2018_50_shades_of_grey_31sbyw.pdfIn PDF document text
    • http://sdek-24.cc/physics_for_scientists_and_engineers_10th_edition_onlineexxcu.pdfIn PDF document text
    • http://anyita.space/73558645916ttap4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_60263b136d11c.pdfIn PDF document text
    • http://menbp.online/grade_4_spell_bee_wordsca30k.pdfIn PDF document text
    • http://premiumpornclips.com/kabubogizb9jo.pdfIn PDF document text
    • http://cethq.xyz/how_do_you_say_youre_welcome_in_pennsylvania_dutchuj05n.pdfIn PDF document text
    • http://socialwave.me/psicosis_novelaiku3n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://levapoloj.onlinewebshop.net/aha_bls_test_version_a_2020.pdfIn PDF document text
    • http://sebokegekesuded.atwebpages.com/can_i_sell_food_from_my_house_uk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 5232 bytes
SHA-256: 3a811c8a60b5b913cbb83423f2a2c311df6cb0df16f367d063c293eeb1cc91d1
font_01_sfnt_off0001047f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047F 11528 bytes
SHA-256: 952cc20e49372e9bd08212317a9e4b4246887d0d2bd4e7e460af3b406ddad7f0

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