Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a83f7febac10312…

MALICIOUS

PDF

67.3 KB Created: 2020-11-25 10:12:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 17bdf442328738f1e14c4dd67c3bfcf0 SHA-1: c062ba5821b2a9901ef439c985cc541fc2852c84 SHA-256: 7a83f7febac10312adfbe109a58b843a7dc6198678142ee36765bf17ebcbe2bc
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many pointing to disposable hosting services, and one critical link to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though truncated and obfuscated, suggests a lure related to a 'guide book'. The presence of embedded links and the nature of the heuristics point towards an attempt to redirect the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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://cctraff.ru/strik?utm_term=viva+pinata+trouble+in+paradise+guide+book In PDF document text
    • https://debaduvevuw.weebly.com/uploads/1/3/4/3/134383420/4598614.pdfIn PDF document text
    • https://xadaxiwunitari.weebly.com/uploads/1/3/0/8/130814235/6243485.pdfIn PDF document text
    • https://ronizozobofer.weebly.com/uploads/1/3/4/6/134654069/metikukevib-kofumara.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/3343981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418199/normal_5faee697d2acd.pdfIn PDF document text
    • https://wiriluwakuzukar.weebly.com/uploads/1/3/4/3/134316185/6500259.pdfIn PDF document text
    • https://mivegogoke.weebly.com/uploads/1/3/4/3/134365655/f9008f9e84.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6620cdcc-f74e-498b-afe5-78592e4d5268/judebudanurujavev.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/why_are_my_android_apps_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4033bd1-9ec3-41d6-b172-e32ea46a0871/god_of_war_psp_cso_mega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d99eb6-b184-4d7e-b7fb-7d69a692bfb5/90270611313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c836ac41-bc4a-469c-bcfe-2edafeecd266/3024305434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca26d01-dc70-40ff-a00a-37ae77df179f/49898514890.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43B 5356 bytes
SHA-256: c090fd128e122c6fae1df3ab92eb5962298ff34794942d5235889fcfe3801f6b
font_01_sfnt_off0000c680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC680 9868 bytes
SHA-256: 51d360324ac8aa27dfbfda60c62b560b426b13138940b8f0ce83ac34c9a643b3
font_02_sfnt_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 16288 bytes
SHA-256: e49e2440fc8147e9bd65c37b26df3123b6e38077609ae1bd7757523f823f8083

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