Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d279bdd1c3f16dd…

MALICIOUS

PDF

78.5 KB Created: 2021-04-15 04:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e32c87031908bc7f6ab725a35d186e91 SHA-1: b1aeb3d4df6f994a00206611e70d10042fe7d94d SHA-256: 4d279bdd1c3f16dd2cf1776976f26163cd89b3f7d471351fb1a3fa89cd562400
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are on disposable hosting and utilize UTM parameters, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=hbs+760+bluetooth+headset PDF link annotation
    • http://natorg.fun/what_is_the_difference_between_phthalo_blue_and_prussian_bluekdvp0.pdfIn PDF document text
    • http://damvglaz2.xyz/schumacher_electric_battery_charger_sem1562axst13.pdfIn PDF document text
    • http://kayikciakademi.com/gulakagulopigexugj6evc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_6037c67181aad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383798/normal_603b0b6d0cd93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463277/normal_6027ff0cbb070.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/toy_story_rc_racer_ride_paris1fgl9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467950/normal_6006c06f64e06.pdfIn PDF document text
    • http://polikarmonolit.ru/what_causes_sores_on_hands_and_armsu91w2.pdfIn PDF document text
    • http://silkhfig.bid/rexomawugaxadonevakeligoxa3ne.pdfIn PDF document text
    • http://7gusevshop.website/thematic_content_analysisuedos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421464/normal_602ee1c25de4f.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/jiwotarotavuz/aditya_hrudayam_tamil.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_b218d4be5d254b88960d9749d5032f32.pdf?index=trueIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_7511f42edf334d00aa4da12a40cb0180.pdf?index=trueIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_b31c5b4003d84abc903b634ecbfc7f78.pdf?index=trueIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_df47bf627be14c36af412f146929b573.pdf?index=trueIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_16147207e7d946caa8b1458949fb0dea.pdf?index=trueIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_a21239dc0db24c47ac0a99a6698f9c78.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_d7f60a5ac3c34b3d98572e6d7bdc99ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/60511274507.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_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 5292 bytes
SHA-256: d9b9a5df5c7ca47f725b5ec0bb07afa01b22f11d2416088bf25b4cb607a8e16d
font_01_sfnt_off00010557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10557 11504 bytes
SHA-256: 7353a49aa8f835a2036efd3c58a39ad9ebd6a8c65a3ff7a47a8c5dea85856527