Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd35db0e589e4fa3…

MALICIOUS

PDF

109.3 KB Created: 2020-12-16 18:04:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f8e76c1898ace274caf7cde05cef0edc SHA-1: 15aa1a783523d7974dea611db4ccca309df3555d SHA-256: fd35db0e589e4fa3f29b3f04afe0bc2f35a19de8329c1783578cec0cfd94b928
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign-looking PDFs hosted on S3, but one prominent link to 'traffnew.ru' is flagged as malicious. This suggests a link farm or phishing attempt designed to redirect users to a malicious site. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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/strik?utm_term=elsevier+veterinary+assisting+workbook+answer+key+chapter+11 PDF link annotation
    • https://vowimusu.weebly.com/uploads/1/3/4/6/134655535/pikarudor.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/963e3722f2acc17.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/9766917.pdfIn PDF document text
    • https://zugasunisozabij.weebly.com/uploads/1/3/4/7/134759734/medakavajut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/psychology_questions_and_answers_for_interviews.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/article_in_english_grammar_with_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/beemovie_2017_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/management_accounting_theory_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/braun_kmm_30_coffee_grinder_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/95147383972.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/pajimoxojerokurexewik.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/jonasixufawumoso.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/27820907005.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000163bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163BF 5452 bytes
SHA-256: efafff9e9a6290727414e77c97b3bb2480693ac6cc879d71729849a0d534dac7
font_01_sfnt_off00017658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17658 10388 bytes
SHA-256: 2f556854cf51249f331d7ef898a0e3c5f4aa46f7a52f518a93246d171b48f5fb
font_02_sfnt_off0001994a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1994A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

Open this report in the interactive analyzer, or submit your own file for analysis.