Malicious PDF — malware analysis report

Static analysis result for SHA-256 210abb560c20ccec…

MALICIOUS

PDF

64.4 KB Created: 2020-11-13 08:41:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bfa8f151855f44bddb0624e5f48ddc44 SHA-1: 1bcd32be869dfd6c8d0b11f55e763885b59fa69a SHA-256: 210abb560c20ccec23d7f47871d18debd0673dffbe6641ff1bdc9d43b3c7b523
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDFs, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged it as a PDF link farm. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/aws?utm_term=apple+itunes+app+store In PDF document text
    • https://pesegomogela.weebly.com/uploads/1/3/4/7/134700410/ffeca0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_5fa2552f4c226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_5f959fcade781.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wovigebi/ziserokotepope.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/rafimufu.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/jubiregokawepolufakop.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/los_valores_humanos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cfc6632-83bd-4eab-abe6-ffa2cec01127/vadefijavifimadekulorodal.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/designing_power_supplies_for_tube_amplifiers_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca2497f-d257-4635-94df-7ffb241bceda/living_language_japanese_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/tirimorilojabu.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/allen_jee_advanced_test_papers.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_off0000c33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33C 4800 bytes
SHA-256: ffd4a02f6da6bf6ca30488c14a381ddf73775586e09e5a7beac11832c62d6044
font_01_sfnt_off0000d39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39B 9940 bytes
SHA-256: a1fe4efea1813dff1df229f121d0289f9d59d1e991098eabe0c26722a1a7daf6

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