Malicious PDF — malware analysis report

Static analysis result for SHA-256 9735d2e80cf47ff8…

MALICIOUS

PDF

67.6 KB Created: 2020-11-22 03:05:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae2d2931324b748f72f456a6f2f4dbf8 SHA-1: ec14710f340907fdb562d138324e309a8f358aeb SHA-256: 9735d2e80cf47ff8c688ef0c6a4f26262a1b4ac5de4c5bd5f10d53722d645761
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and a large link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO-based traffic redirection. No scripts were extracted, but the presence of malicious links is sufficient evidence of a harmful attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=us+visa+invitation+letter+template+business
    • https://xurigatunirefor.weebly.com/uploads/1/3/4/6/134635133/fewugib.pdf
    • https://kunisalopug.weebly.com/uploads/1/3/4/3/134315348/5056386.pdf
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5fb764ce730ae.pdf
    • https://cdn-cms.f-static.net/uploads/4419633/normal_5fb7288087b68.pdf
    • https://cdn-cms.f-static.net/uploads/4385422/normal_5f949c603297a.pdf
    • https://cdn-cms.f-static.net/uploads/4368496/normal_5fb9a3379c00d.pdf
    • https://cdn-cms.f-static.net/uploads/4425909/normal_5f9a2eb10516b.pdf
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/3c48b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wujodibu/85217688888.pdf
    • https://uploads.strikinglycdn.com/files/f51858dd-8fd2-478e-9de2-d972b98ff2f2/pesurorut.pdf
    • https://s3.amazonaws.com/bisegilupuf/a_grass_sandwich.pdf
    • https://uploads.strikinglycdn.com/files/ff0dbe67-c11a-446b-a2d8-43293418ba91/jijipomovipebanefubal.pdf
    • https://s3.amazonaws.com/kuboki/bulakapesuwozerafoz.pdf
    • https://uploads.strikinglycdn.com/files/b757d0c1-0a5a-4283-8ad6-a1fa46360f64/badlands_chugs_health.pdf
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce23.bin
1b7b0497d85dcbd82f19070dc3bdcf012101494c8a51ce381de142750746f1ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE23 5156 bytes
font_01_sfnt_off0000df9a.bin
079cb71122ada6ae89be1b502aa522a4d7c0f4e4042698f61af9762ac957947b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 10348 bytes