Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c0717a66ce57d4…

MALICIOUS

PDF

121.2 KB Created: 2021-01-28 07:10:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 08a2b4ee5a8be2961e68dc2993c085bd SHA-1: 7048a3e0f74929f15a55f500adc24fb2d7075383 SHA-256: f9c0717a66ce57d41d54ddd8f1635b3064afd22f678bfba596ba8d1b967b81ea
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The presence of an embedded URL and the ML classifier's high confidence score further support the classification as malicious. The document body, though heavily obfuscated, contains keywords related to 'Bangla natok 2018 free hd', suggesting a lure to attract users to the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/aws?utm_term=bangla+natok+2018+free++hd PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380523/normal_600d00026a565.pdfIn PDF document text
    • https://gaturavokig.weebly.com/uploads/1/3/4/3/134317265/gopolipitorosa.pdfIn PDF document text
    • https://cdn.sqhk.co/lunapolakezo/ieVCWDA/hitman_agent_47_movie_guns.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366969/normal_5ff1704035199.pdfIn PDF document text
    • https://rumarefux.weebly.com/uploads/1/3/1/0/131070750/a6880366c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393369/normal_5ff12340a5b2b.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/hcMiihx/24124679442.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/fhfZviZ/planet_of_the_humans_review_nyt.pdfIn PDF document text
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/284320.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5ffb8f393a182.pdfIn PDF document text
    • https://fuzedefona.weebly.com/uploads/1/3/4/5/134578490/sebegalile.pdfIn PDF document text
    • https://cdn.sqhk.co/taxosavasesa/bjegcgj/om_nom_run_online.pdfIn PDF document text
    • http://kindraretterath.com/age_of_empires_2_hd_fast_castle_build_orderjqbqu.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/hlXjagf/do_koi_fish_give_live_birth.pdfIn PDF document text
    • https://cdn.sqhk.co/povuguzuloga/hhBSHie/54467711540.pdfIn PDF document text
    • http://citruss.space/assistive_touch_ios_13_mod_apkhgton.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/CLKidij/23706325781.pdfIn PDF document text
    • https://tugokuwotim.weebly.com/uploads/1/3/1/3/131379049/93be36f2951.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA5 5624 bytes
SHA-256: 7aa1dc7d433f0c7e8a985cb617eed90a8ed184ab33fa011218cc9a1294037dcf
font_01_sfnt_off00016fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FCC 12792 bytes
SHA-256: 61916510986bd9d19a615a6a37055853a7566e22706029d49e00b7fde1717980
font_02_sfnt_off000196d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196D0 12256 bytes
SHA-256: cf04ba7102c4750725f9346ba73f50d81162933d0be720aa8af6e7a604839e06
font_03_sfnt_off0001c041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C041 16064 bytes
SHA-256: efaebc7f989c1eca2ccf25136b1a091986f2e56f831675b984605c8831c738ae