Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e6f2cfc77476c6…

MALICIOUS

PDF

73.2 KB Created: 2021-04-04 04:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 979272b615d675bc46b25f983b7795cc SHA-1: 6ccfe4465ea9fb7fff41b2504d46ee144069603e SHA-256: 56e6f2cfc77476c6b3ce0a98658ddda8a1c95eebcf1c04234dd6dcfbcf7baa1e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely serve as a lure to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/wix?keyword=improving+vocabulary+skills+book+answers PDF link annotation
    • https://cdn.sqhk.co/xurawupo/hjFhdij/redacted_report_mystery_object_harry_potter.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/hggWhhR/create_answer_file_windows_10_wds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484376/normal_606560ce7b098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416792/normal_60655e2260092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_600bc633dddfb.pdfIn PDF document text
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/5d6ab3.pdfIn PDF document text
    • https://cdn.sqhk.co/womafafowix/50Avjdk/marketing_strategy_journal_2015.pdfIn PDF document text
    • http://pipazodonuwadu.iblogger.org/enter_the_gungeon_beginners_guide.pdfIn PDF document text
    • http://tujugebisuxilun.22web.org/polelesekakejodotikidobo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365660/normal_5fc9e3ead60d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467589/normal_605efc164d072.pdfIn PDF document text
    • https://fizokufewof.weebly.com/uploads/1/3/4/0/134096090/bovinatopelegoz_maworodakilavov.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/gVPqy3O/62307590331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_604efc1f33f51.pdfIn PDF document text
    • https://cdn.sqhk.co/pevizopubok/haijhid/little_alchemy_2_combinations_with_time.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476416/normal_6019ae995fe83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_60521eb028c38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443344/normal_60036f9970a9e.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/gihWje5/power_starz_ghost_and_angela.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigizakeku/DhbhjLa/rc_car_races_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475989/normal_60298dbfe1c4b.pdfIn PDF document text
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/powupu.pdfIn PDF document text
    • https://muneberixiloza.weebly.com/uploads/1/3/4/3/134339704/wemasimivuzuni-gerugoze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xubomegixabax.epizy.com/fisher_paykel_double_drawer_dishwasher_reviews.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_off0000dc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1B 5648 bytes
SHA-256: 73dcd2e4f2ca6d53e35829e92d5e8cb1349ee306f28fe2649fd6f37bcb3ed998
font_01_sfnt_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 11212 bytes
SHA-256: 7c08600a83cbe7573bd3c0cc8235b98b5780515f08098b3a1a7e26d72f59db56