Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce683a6a407c555…

MALICIOUS

PDF

75.2 KB Created: 2020-11-26 08:55:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 306f1bf3c9148a976ec097a799841eee SHA-1: 53301bae4bc371265f7d97f769a87172298b0f69 SHA-256: 3ce683a6a407c55513d1e8034d803d54cea5a475352efe0c9e13ada799c5a8cb
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic firings indicate the document is designed to redirect users to potentially harmful sites, leveraging lures like academic material. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/strik?utm_term=ap+biology+campbell+10th+edition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5f995f42218ad.pdfIn PDF document text
    • https://valetapos.weebly.com/uploads/1/3/4/2/134265584/70ca9a943b70c5.pdfIn PDF document text
    • https://jugoruzaja.weebly.com/uploads/1/3/1/4/131407370/zekidezuturejid-jaguxik-fometogewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f86f500323a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_5f9c881c9275b.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/a711544a-fe02-47b9-9ea4-b91add0d5834/tilepevisimikuxarewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5875c11-9050-4154-8e12-559d68330548/30339699678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d58c546-5303-4270-ad66-5c8e49e93e01/74587274775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6894c11d-a830-4fc2-8024-9cc9f69dfd68/pelotabozaximutufit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12660538-773b-47b3-9102-9c6c1b25c694/fozivojejipizaravivapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54b4d5bd-e648-41cb-86da-ad1874f8e8a1/17504002481.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_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 5720 bytes
SHA-256: ac7b9e07a4e09e6dbeba26663c50d9283de403b75190406353eca77e95f4a35b
font_01_sfnt_off0000fb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0F 10976 bytes
SHA-256: 9d5eef91e92d6ae7d115601fba9e5fd2cb29c6eef321d6a97add45f068d3078e

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