Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12290a003b51fe1…

MALICIOUS

PDF

72.5 KB Created: 2021-01-03 11:37:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f76988216204d185bcb330148a619f53 SHA-1: 90d5efa025c1947896b5d850a175af9a9ae1e829 SHA-256: d12290a003b51fe1297160e76b99a73449b1b08221d9324d2402484ed4d020f2
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and sqhk.co domains, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to deliver second-stage payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/aws?utm_term=pdf+splitter++filehippo PDF link annotation
    • https://nifevokore.weebly.com/uploads/1/3/1/4/131437532/e238d418e44.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/hcigeie/doxapakipikibibipovano.pdfIn PDF document text
    • https://voxapuxunud.weebly.com/uploads/1/3/1/3/131381802/woxitolenusonexux.pdfIn PDF document text
    • https://cdn.sqhk.co/kisunika/jJjdWjj/wazagis.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/Y28DeAD/boxing_last_night.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/XsSgf39/snes_games_list_with_pictures.pdfIn PDF document text
    • https://bivamotitujodo.weebly.com/uploads/1/3/4/7/134712473/zajuw-mofidixodomoxe-memaj.pdfIn PDF document text
    • https://fusefediwotedi.weebly.com/uploads/1/3/4/5/134589876/7293230.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/ighbigP/87903721866.pdfIn PDF document text
    • https://cdn.sqhk.co/sajixobuko/sQjgjhH/healthy_vegetarian_snacks_for_weight_loss.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/cgchcY2/mdanderson_cancer_center_careers.pdfIn PDF document text
    • https://xuzexutibezime.weebly.com/uploads/1/3/4/9/134904436/8606840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_5f9226b94cdae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 4920 bytes
SHA-256: c1fe97540bd8bf6f2f6dc376e0ccdc6d712e8af7df83d9546c137fb4ba389f91
font_01_sfnt_off0000f16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 10532 bytes
SHA-256: 44ef33387388ebb81d49f22a796438534a78b482ef45fa69331d71c745ce2c79

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