Malicious PDF — malware analysis report

Static analysis result for SHA-256 99726ee4ec128d18…

MALICIOUS

PDF

74.1 KB Created: 2021-01-25 20:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fd511c4ea6b67d5223c473fdf46505cb SHA-1: d3dd811fc9ee7e9b8c867a21f474b68b10b23a68 SHA-256: 99726ee4ec128d18f32d8558f922605b3a3b8f137197a4fd61b5ea05042a1c81
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains a large number of external links, many pointing to PDFs, suggesting a link farm or SEO poisoning tactic. One of the primary URLs, 'https://baarspo.ru/aws?utm_term=cognos+analytics+report+studio+training', is likely used to redirect the user to a malicious site. No scripts were extracted, but the PDF structure and numerous external links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/aws?utm_term=cognos+analytics+report+studio+training PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403823/normal_60060f59e8e09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405946/normal_6006e1c9c6e0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409250/normal_5fd68a3301008.pdfIn PDF document text
    • https://cdn.sqhk.co/zaxuloxedu/BggGheV/wexavopube.pdfIn PDF document text
    • https://sanijala.weebly.com/uploads/1/3/4/8/134889677/ae24967.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450896/normal_5ffd33f937b3b.pdfIn PDF document text
    • https://xukizawumu.weebly.com/uploads/1/3/1/3/131380236/bimipawemaras-kupojidafulud.pdfIn PDF document text
    • https://pinukavuzufov.weebly.com/uploads/1/3/4/3/134307945/87786bd501bbf57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464541/normal_5feb215cd41f2.pdfIn PDF document text
    • https://cdn.sqhk.co/xawowatu/geiggfI/mipafakifoxetifemigisizog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_5fd2259d6f0b1.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/ZZcX9p4/zugepufujupetudimi.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/gfghzVz/sezipamijig.pdfIn PDF document text
    • https://rogosibaf.weebly.com/uploads/1/3/4/5/134590501/zifofur_lebuvov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://karifopiti.epizy.com/benzoic_acid_safety_data_sheet_sigma_aldrich.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/7398282284.pdfIn PDF document text
    • http://rulenanevatetid.epizy.com/86868066611.pdfIn PDF document text
    • http://gipanitefoj.epizy.com/healthy_eating_plan_for_weight_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/battlefield_4_pc_game.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/52756322363.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_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 5248 bytes
SHA-256: 6b1cdebccb1cff9fd30766e7b0b68ee3787793fbef737c9baa20b79ee5e0b90b
font_01_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 10304 bytes
SHA-256: 89548631ef9d10e8866f261c9cfa1dcf12d1277ff2f36e72239ce24dce7828ba

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