Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f9d8f2ea4f71e5…

MALICIOUS

PDF

59.0 KB Created: 2020-11-22 00:47:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c4c818c423a6d4e3eb8d22094ae42c7 SHA-1: 591df110a4c5a67587ff3aa91de15080e1768d2b SHA-256: 68f9d8f2ea4f71e58576de5a46a93443458ef963fa103e944dbf1290eb5115ce
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive URL usage are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://traffnew.ru/123?utm_term=mat+man+letters+template
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f879c4d48af3.pdf
    • https://dotofopig.weebly.com/uploads/1/3/4/3/134307416/5184695.pdf
    • https://cdn-cms.f-static.net/uploads/4458849/normal_5fab261de6089.pdf
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/8306388.pdf
    • https://pujawuto.weebly.com/uploads/1/3/4/5/134588096/nepinijeb-zazivozijikipeb-viboni-vetizuxi.pdf
    • https://bafipiwefewojex.weebly.com/uploads/1/3/4/5/134576197/dapadexoxofeg-rixuvoso.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/logape.pdf
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/jelakuzisegogulopo.pdf
    • https://buxivadoga.weebly.com/uploads/1/3/0/7/130740323/3479789.pdf
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5f8a15491c04e.pdf
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/8237609.pdf
    • https://sinepakeje.weebly.com/uploads/1/3/4/4/134490574/lukosupina_nufiwojezani.pdf
    • https://sitizoxibe.weebly.com/uploads/1/3/4/3/134317871/db27889c3a827.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac35.bin
db0c1e20f480b0b00112c2046c3c4c6d0beab794364244e59132e3edf06358ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC35 4972 bytes
font_01_sfnt_off0000bd0b.bin
ac17033b06ca26bf7f841a622212e1258938fc6465a92cfca5d8540b33b2f78b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0B 9640 bytes

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