Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e0f643b632deef3…

MALICIOUS

PDF

60.3 KB Created: 2020-11-18 00:14:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9f0103b193bc939c17484cec7f50fd17 SHA-1: 352c5a135ca5cdc979f1732a0cc559e7995fd8b4 SHA-256: 3e0f643b632deef3ca544e5fb8976000d40ba675989a191b4ab6654d4195a6cd
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV also flagged this file as malicious. The presence of numerous external links suggests an attempt to lure users to potentially harmful websites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ggtraff.ru/123?utm_term=the+silencers+ska+band In PDF document text
    • https://fijevomakikedu.weebly.com/uploads/1/3/0/7/130740050/674edaa5630c1.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/sixatuzatena.pdfIn PDF document text
    • https://mimusazufuxor.weebly.com/uploads/1/3/4/5/134500801/984876.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8980310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476767/normal_5fad94c0ea661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384029/normal_5fa6bcf0c8498.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/5484608.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/e98214c5-e0df-4d1e-8166-326f1c00b585/12364082477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/612ddfa0-bc38-409c-8afa-7c1409b8bb22/45051968537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92c8d083-5d3e-4936-81b4-cd68f33b0df5/tevamujafazov.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_off0000b004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB004 5180 bytes
SHA-256: fdd549f097928d7e422d45bf136669758f51baaa23f9b5b694e1c2b03ac6f605
font_01_sfnt_off0000c194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC194 10312 bytes
SHA-256: 05a86b0fa40737353dc45bb36ae77084da63143c34e20aff889fa2c6f58ec092

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