Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b614f71b846adb…

MALICIOUS

PDF

65.7 KB Created: 2020-11-25 21:04:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 886526ecb48ec86d96c9e1341667e409 SHA-1: b09dbb80ef9389c3a547c195cde5af6a86ceedda SHA-256: 81b614f71b846adb75f6926c25e2f73ac643642f6ed45ba656b37a495c9b138e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffine.ru/aws?utm_term=los+aminoglucosidos+pdf'. ML classification and ClamAV also flagged this file as malicious. The document body appears to be corrupted or obfuscated, but the presence of a malicious URL strongly suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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=los+aminoglucosidos+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5f894cb037ab9.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/885b9c66-5f33-4ac2-a23a-97ca24489382/fefojodape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f14de2f-891c-423c-99fa-d27fa4a66a31/the_cuckoo_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/27529934781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/962781bd-d3c6-4539-ac42-b27842c44fad/53830914689.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/lakerufa.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/55495618411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e95925e6-e852-4958-80ee-e14857d7b58b/19598826733.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/shinjuku_map_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84bf9a8f-741b-4c2c-bcc0-c0ca82bde87b/lidadilurapikufotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec690419-dbca-488d-b7d4-7ba9d84f6a21/crusader__rolands_legacy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85111b3d-9091-4f61-bb7e-e3e99366b4dc/95775510024.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_off0000c28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28A 5320 bytes
SHA-256: 06845b99e2ec22f77b97a691094f63128d84043f2a02543541c110f09cb5331b
font_01_sfnt_off0000d49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 11176 bytes
SHA-256: 999dfa8cd17223af9273c9779894c44ef6fb9dae86fbb7b7fa98d34709e7404f

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