Malicious PDF — malware analysis report

Static analysis result for SHA-256 8039042d3e46dbc4…

MALICIOUS

PDF

71.7 KB Created: 2020-12-20 07:46:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 06a6391b20f6244e4da60cb268cd82fc SHA-1: 13da90289835044b7f4a4caef23c5866750b1f8e SHA-256: 8039042d3e46dbc441dcea9ed4fcf405e54c45a4c48e212d2ff9672988694046
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector and a link farm. It contains numerous embedded URLs, with at least one pointing to known malicious infrastructure. The document body, though heavily obfuscated, appears to contain metadata related to the links, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the primary attack vector appears to be the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=sailcloth+watch+strap+australia In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389355/normal_5f9ff65ed9f06.pdfIn PDF document text
    • https://dunofedipusafo.weebly.com/uploads/1/3/4/4/134477286/xewalivaru-xoridejum-momar-xepegivek.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/vumilogimovopudiju.pdfIn PDF document text
    • https://mawubisevidezo.weebly.com/uploads/1/3/4/4/134480432/kapimikusivefun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454302/normal_5f9fd1f9218ba.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/26401.pdfIn PDF document text
    • https://pebabole.weebly.com/uploads/1/3/4/6/134698512/nidun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc2b91160f2895dc1f3a0a6/t/5fc5108718e72e5fdb783d67/1606750344775/74830646108.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e006a879396864083677/t/5fcfd7fea70f811812f33664/1607456766372/fish_live_wallpaper_app_download_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5cea240f1034a5cca809d/t/5fc90c1de8e3bb7df8e1d8d5/1607011358736/cnc_thread_milling_cutting_programming_machines.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/dopibixu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd6e2c6d96458361c2338/t/5fc161ffa97599144e2b427f/1606509056580/rokitulix.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_off0000cbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEF 5216 bytes
SHA-256: 08262ca5d59c6409730ff8ef86901d79c08bf8ea523b712f7ce569572c97b7da
font_01_sfnt_off0000ddae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 3412 bytes
SHA-256: 2b367447f518257652a2f6626ea660a1077cebdc92bd431036cec886f2b0fdec
font_02_sfnt_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 11332 bytes
SHA-256: a48d49467dc2631d0bd5c825c4371f1e41ed2b12b7f134f3f9b4fc2114377760

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