Malicious PDF — malware analysis report

Static analysis result for SHA-256 488910f39103d14f…

MALICIOUS

PDF

85.4 KB Created: 2021-02-19 05:17:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a216336536447be7fb9a5c54f9248369 SHA-1: a78e39bdd4640298756601acfee93f6ecb6cc8ba SHA-256: 488910f39103d14f55512d827ca3a4297ad4eb5968ce35244d63ed7b9b92068c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jacksth.ru/strik?utm_term=dark+souls+3+boss+order+reddit PDF link annotation
    • https://xamoguxa.weebly.com/uploads/1/3/0/8/130874300/d85b2bb193b64.pdfIn PDF document text
    • https://cdn.sqhk.co/wutalididow/dM1haGS/detective_conan_the_movie_cast.pdfIn PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/fevetenomus_dosozomimis_segoza.pdfIn PDF document text
    • https://cdn.sqhk.co/pabilere/cajbifj/rare_beauty_eyeliner_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404984/normal_5feda42089778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495039/normal_5fdc7d898bd51.pdfIn PDF document text
    • http://reduslim-shopofficial.site/29227815849c9f2s.pdfIn PDF document text
    • https://luwojasog.weebly.com/uploads/1/3/1/3/131380471/tixujexe-gopeximufupir.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/hngjugd/neha_kakkar_and_tony_kakkar_new_song_2020.pdfIn PDF document text
    • https://mamumudud.weebly.com/uploads/1/3/0/8/130814078/1eb88daf7e031.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/ighaMjV/wwr_warfare_robots_game_mod_apk.pdfIn PDF document text
    • https://sesirolomozanu.weebly.com/uploads/1/3/2/7/132741009/4789573.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/wujodibu/xiziki.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/types_of_lm_guideways.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/32728003865.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/pejaluru.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/hwidgen_reddit_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/excel_timeline_template_with_milestones.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_off00011155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11155 5188 bytes
SHA-256: 2ee409fae4b2e41258d4d3691b2ed1df8353f23a9b02909e254d9e9349b73ba7
font_01_sfnt_off00012309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12309 10916 bytes
SHA-256: a78d0a3d095dc0b0b919c70b043fcbac2b195ddec22b7b190f712cdc32211e9e

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