Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d1f32b0676adf2…

MALICIOUS

PDF

73.7 KB Created: 2020-12-19 08:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6f3219d104c8eb1e9346d7144cef9740 SHA-1: 11c6b5ae59fd45fd95efd92b7b95ab18c1d02c55 SHA-256: 04d1f32b0676adf281986a61d26e4a24fac783d2911f3917ee22983b6437bd2f
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 of which point to resources that appear to be part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious sites.

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
  • 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/123?utm_term=books+like+i+am+a+cat PDF link annotation
    • https://mamonujiduvef.weebly.com/uploads/1/3/4/5/134525279/8679875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447280/normal_5fa81cd072861.pdfIn PDF document text
    • https://sumomaduge.weebly.com/uploads/1/3/4/8/134884200/bemubaxakipeb_mumid_kukisufax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459341/normal_5fdc71f3696b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_5fc20d3780d3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450249/normal_5fc684052c7bc.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/jemazejodep/amazon_prime_video_onto_pc.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4e08e8787e879898555ed/t/5fd71484154d7278710421db/1607931012767/46115346971.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e0f3f7cf8c75402ad020/t/5fc1dadf3c02f22b9d512049/1606540000086/nationalism_in_india_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ef2ff1f-a16c-4864-925e-d96813f83300/charlie_bone_and_the_time_twister.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d57abd14ff0dd29c5223/t/5fc191ce5147b148046ea83c/1606521295483/wells_fargo_employment_verification.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcb8173599a867de449200/t/5fdcea19816647689463cbce/1608313369383/mujesikel.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4c503485235c86bcb387/1606372434297/74025234011.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/find_the_circumference_of_each_circle_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a1f7d5-1c24-4015-97aa-f422ea0fbfaf/11036246518.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_off0000e42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42F 4964 bytes
SHA-256: 9c7768a046c635552b0871386f04836264f367544ad302dda33eba9d0b577fb6
font_01_sfnt_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 11140 bytes
SHA-256: 50a1adb03794fb5b49403cab06c2078333c8b8f66f811c508a08f4bdd14ee9f7

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