Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c7b2735be076e1…

MALICIOUS

PDF

76.9 KB Created: 2021-04-19 15:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 00266693275bce67ef1f00bd533c7115 SHA-1: 1fdc7e09b0de3132f61ee0db9c4274afbe3c476b SHA-256: 86c7b2735be076e12af24bdbb0ec5626dfed9325cad19d7da6f58581012ef2ee
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('golowaki.ru') that is flagged as an external URI. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=how+does+co2+get+into+the+chloroplast PDF link annotation
    • https://cdn.sqhk.co/pekebugus/Hhifgd8/34466897074.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485714/normal_601634cbc76a6.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/jiifLA3/84611750381.pdfIn PDF document text
    • http://berilunowalaz.iblogger.org/27987490508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404755/normal_602bb0397b88d.pdfIn PDF document text
    • http://jigitozunawada.66ghz.com/tallest_building_in_the_world_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/djqyjfm/valaforotuxif.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/V0ZH9hg/mejuwavetimagasuxofu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/goviwigax/my_favorite_things_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c27704f-bea6-4661-a861-ab3e4b5f96b1/54357939970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3712c1f1-bd0e-4280-a6b5-665e6df03fe4/4168882694.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/olympus_camedia_e-_20n_manual.pdfIn PDF document text
    • http://zepukedosapiw.rf.gd/percy_jackson_and_the_olympians_movies_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fadd78ff-a335-4410-8582-8758417c80dd/lenovo_t430_specifications_and_price_in_india.pdfIn PDF document text
    • http://dipumekamerara.rf.gd/73218442797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3c3a3c-665f-4d7b-b8b9-bb3493785d27/health_and_safety_examples_at_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51676441-02f5-49dc-bfc5-6a26f46ee4e0/what_does_hanegraaff_mean_by_forbidden_knowledge.pdfIn PDF document text
    • http://lirebeto.rf.gd/50806217458.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/where_are_all_the_customers_yachts_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/p90x_ab_ripper_video_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3da7cd6-5549-4488-8017-15e3aaf99c13/blackmagic_design_atem_television_studio_pro_hd_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc79059a-f2ce-49aa-bb56-cbd37a31b1a3/63066130789.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_off0000ee5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 5520 bytes
SHA-256: 67f0ebce2e87c60c8201a33e7f8d643c7fcc5a7572c11978617708ca100cbcd4
font_01_sfnt_off00010136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 10980 bytes
SHA-256: 913f38901a7beb4aa5a8522889f7ff48eca3390063ccaa9a9de6f13393db6ea0