Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfabbb8fec0639f…

MALICIOUS

PDF

114.3 KB Created: 2021-03-31 13:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3068d79f2101012e8a0be2926b1cce50 SHA-1: 54d4aa1a83bf49b6edeeb2b9a859d49f457bdc58 SHA-256: fbfabbb8fec0639f742e85c3357f4f9e0eaeb94c5f802949a272390c53357714
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards malicious content designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=hadith+bukhari+english+pdf PDF link annotation
    • https://cdn.sqhk.co/zanewijepex/ghLljes/pix_mix_app_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mabisurud/igiCqjb/scary_ghost_sound_effects_free_download.pdfIn PDF document text
    • http://tifubuza.22web.org/woolworths_online_application_form.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/jjgdibp/wars_of_religion_holy_roman_empire.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489980/normal_6001d42e86792.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/jhgNii6/butowobifad.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/bGX6uTP/best_american_cowboy_boots_brands.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419629/normal_604ef08a23390.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5ff98fd7645df.pdfIn PDF document text
    • http://linefesejewug.sportsontheweb.net/77090307125.pdfIn PDF document text
    • http://guferesuzas.22web.org/giramoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381766/normal_604fd371b7460.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gefuwaw.atwebpages.com/maternal_nutrition_and_fetal_development.pdfIn PDF document text
    • http://putazosaw.epizy.com/leluvemumuka.pdfIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_f62fdd8a24094aceaf55d0713915bb92.pdf?index=trueIn PDF document text
    • http://konazosite.epizy.com/ccna_3_chapter_1_exam_answers.pdfIn PDF document text
    • http://gavomowiwolaxu.rf.gd/anemia_peru.pdfIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_524c45b57aa34fe29a0ed8fccd60b651.pdf?index=trueIn PDF document text
    • https://a5f97fb6-6895-4a42-8c51-2de4018fe37d.filesusr.com/ugd/1eae48_f6f52ae374ee4b33a9ec1cca295b100e.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001859e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1859E 22960 bytes
SHA-256: 338568da9cd06100da4963cdd70497ca196612a9835f929f2ebfa82e9d57f6bc
font_00_sfnt_off000149e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E4 5240 bytes
SHA-256: bdea870d36c0dc15283462c69e650fbc8e13d273055aa3e656d75c68b856a155
font_01_sfnt_off00015ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA0 12876 bytes
SHA-256: ede55e81d1734a300850a0790ee4bf170f493c47e37bfd84ced074bc3b317b75
font_03_sfnt_off0001ad4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD4C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c