Malicious PDF — malware analysis report

Static analysis result for SHA-256 6834f16cd772ed5b…

MALICIOUS

PDF

74.3 KB Created: 2021-03-02 23:16:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 14541bdd29e3e4c1eb25bba2259c95fe SHA-1: d8717b32ad14104f0b89b775e0543aa183e5dd12 SHA-256: 6834f16cd772ed5ba5a65266496a59add2bb26e482bfa55823a4a2cd72514717
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, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document, likely used for initial access via phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=what+are+greek+suffixes PDF link annotation
    • http://buylettersonline.com/9839516514ov996.pdfIn PDF document text
    • http://cmbclientes.com/what_is_the_theme_of_little_red_riding_hood_and_the_wolf4onv7.pdfIn PDF document text
    • http://ketotreno.buzz/ropokapufojakemominigollo3vn.pdfIn PDF document text
    • https://selijexobava.weebly.com/uploads/1/3/1/8/131856120/5577541.pdfIn PDF document text
    • http://bestplacefor.rest/elite_platinum_epc-808_ss_electric_pressure_cookerq1w4f.pdfIn PDF document text
    • http://kidepokapila.22web.org/17577684639.pdfIn PDF document text
    • https://cdn.sqhk.co/jebavimot/nghvjaV/56712377446.pdfIn PDF document text
    • https://wufisosudima.weebly.com/uploads/1/3/0/8/130874090/23722c989a6d42.pdfIn PDF document text
    • https://sasujenag.weebly.com/uploads/1/3/5/3/135337218/9c20b625c8330.pdfIn PDF document text
    • https://fevapeju.weebly.com/uploads/1/3/4/4/134468187/talet-kelotepomebuwaj-jafovojuwezaf.pdfIn PDF document text
    • https://lovaxases.weebly.com/uploads/1/3/4/6/134685664/1356304.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://luxepiluwi.epizy.com/pulau_ubin_cycling_guide.pdfIn PDF document text
    • http://suwedafi.epizy.com/west_side_story_full_movie.pdfIn PDF document text
    • http://xogejutir.rf.gd/5920001737.pdfIn PDF document text
    • http://japorivexasore.epizy.com/ludumufidusapijulonad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 4808 bytes
SHA-256: 46880459369c2ae546788b7830b1072ba8e2faf91994af14ba9bd31f9bf3ba0f
font_01_sfnt_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 9596 bytes
SHA-256: 5b8f43103c2d92ec47fa73b0c0c2ad54ff50a0af4e85bfd7d44266867490b2de
font_02_sfnt_off00010eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBA 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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