Malicious PDF — malware analysis report

Static analysis result for SHA-256 6837daa15640c731…

MALICIOUS

PDF

76.3 KB Created: 2021-03-06 11:08:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d30da9c9da0d3b4894acd3b4164d1e2 SHA-1: c9a81f026954f2622ca894c511b617ebf0d3bcaa SHA-256: 6837daa15640c731c5531618307865e742f084dba39e271a80ef1e60ea10e14a
184 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5485

Heuristics 5

  • 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.
  • 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
  • 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/award?keyword=wordly+wise+book+8+answer+key+lesson+9
    • http://sefegusekepuxa.mypressonline.com/hp_elitebook_2740p_ram_specs.pdf
    • http://xexapitanegis.getenjoyment.net/vegefepovimuwepexil.pdf
    • http://paxezot.getenjoyment.net/bella_vita_salon__day_spa_leavenworth_ks.pdf
    • http://lenusabipowezo.getenjoyment.net/35532684770.pdf
    • https://ritosameb.weebly.com/uploads/1/3/4/2/134266106/pikozefoginuf.pdf
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/xajefusewiziwigix.pdf
    • https://gobodozi.weebly.com/uploads/1/3/1/3/131398455/9678146.pdf
    • https://rofazipupu.weebly.com/uploads/1/3/4/5/134580110/kifoxafujiru.pdf
    • https://tafubevodila.weebly.com/uploads/1/3/4/0/134016741/ronopopepezab.pdf
    • http://tivirazetuxozux.22web.org/bahadur_bengali_full_movie.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_a891a41f2d0648749ed6961c0f8e3d25.pdf?index=true
    • http://rowomasogig.epizy.com/investigation_report_sample_template.pdf
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_71c7f0172fce4a8aac2aee1ead6b9ea9.pdf?index=true
    • https://s3.amazonaws.com/fotepopunaj/josipovuzupipizun.pdf
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_550b5950c2af4940a665eb25b0617f1e.pdf?index=true
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_d728e27fcbe340bba4b1ab7739d64e30.pdf?index=true
    • https://s3.amazonaws.com/vebenok/wakudajezutedid.pdf
    • http://petizitopebil.epizy.com/60134776999.pdf
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_e21ab10ee7d3468cad92fe93e9e760ec.pdf?index=true
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_cd097962757f422480c77363662e332d.pdf?index=true
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_9e0e953ef5fe4c8bb3baeb6b358929ac.pdf?index=true
    • https://s3.amazonaws.com/kavugusepe/literatu.pdf
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_f39c0d53af724e96a776739d7a330ef3.pdf?index=true
    • http://jupegojut.atwebpages.com/dekifazulawaxetos.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f31f.bin
498a1da5164e2f7143369c0efde39b2f6a9f4284d01981165956c438197699b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 5288 bytes
font_01_sfnt_off0001052e.bin
0bffd705c9a6c414e42a2e2bcaa5fe16f095ab280e204cd286cd92f34742cc43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 10604 bytes

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