Malicious PDF — malware analysis report

Static analysis result for SHA-256 907a5e728c21069a…

MALICIOUS

PDF

72.7 KB Created: 2021-01-06 11:08:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3a647f87eda551c135b04d6f21279889 SHA-1: 96c2ce9ff7ef5848c3d1d022f20a75957357c699 SHA-256: 907a5e728c21069afacb6f5511e769a0baf94823e09d54b5e5724edda046edbe
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links suggest an attempt to direct users to phishing sites or download further malicious content.

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://traffmen.ru/aws?utm_term=delfino+plaza+sheet+music+trumpet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4498983/normal_5fc19d841eb0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_5f8bac880c8a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5fc17a2660439.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392873/normal_5fccf4f0b559d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5f8960a562b02.pdfIn PDF document text
    • https://wofudanizosaxig.weebly.com/uploads/1/3/1/6/131637209/370362f8d.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/Qbgecja/analog_film_photo_filter_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382965/normal_5f95a4ab4f23c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381344/normal_5fc60176cac7a.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/91c89d2b-ace2-4f25-b8f7-39aea4edc0e1/54723386525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3df81407-add9-466c-8ef4-1960d42687f6/my_heart_will_go_on_mp4_video_downlo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5a8f14-4e7d-48e1-a427-502d6601521b/brother_ls_1217_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bbb3066-36e5-407c-a057-beb771331004/city_limits_colonial_heights_va.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe133acf-5aad-4bb5-a710-6bd0a1f25ec9/dnd_side_quest_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3092766a-822a-4a5b-bc2e-71ecd49fd715/rugudinodawobe.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_off0000da36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 5304 bytes
SHA-256: 3ca99f9a44beb1762471c347dfeccc7e4c80c0978848903ae0a656f581b9fd20
font_01_sfnt_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 12564 bytes
SHA-256: ea8de0543b141f256faa147c3e469cd10219d81f5ab0ce8c0172d55db40b6442

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