Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33470b7746fa6a1…

MALICIOUS

PDF

80.0 KB Created: 2021-05-13 19:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 08a5150dc85f1685758f0dfd9eb63373 SHA-1: 2d19e8d1c5d866eb96f0758418b6f5f50f03fc2b SHA-256: a33470b7746fa6a11c8f50716b5fa6010e85a0a4aefb9ba15c8be00abcd78770
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 of which point to redirector infrastructure or are part of a link farm, indicating a phishing or malicious content distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were extracted, the embedded URLs are the primary indicators of malicious activity.

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://yafferge.ru/strik?utm_term=cuento+las+medias+de+los+flamencos+autor+horacio+quiroga In PDF document text
    • https://cdn-cms.f-static.net/uploads/4444370/normal_601d130756218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465389/normal_6037dc8b1b157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465537/normal_605b1cc847b48.pdfIn PDF document text
    • http://gonzo-3d.com/heil_error_codesjr5q2.pdfIn PDF document text
    • https://buxenawemino.weebly.com/uploads/1/3/4/5/134581697/7532046.pdfIn PDF document text
    • http://gk-kuban.ru/weturevowemggf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394060/normal_600481c45123d.pdfIn PDF document text
    • https://rijumiwotoresu.weebly.com/uploads/1/3/4/4/134490354/a2bd764899a4e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495681/normal_5ff60e31a3785.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/jagux/airplay_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/kurinivizegoziru.pdfIn PDF document text
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_8a7c6dd755244238a4ce1df2a23d37cd.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_b2aefd5c21cd4e079243d2d6f7438fe0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80cf9757-d928-4583-959d-4368d402443e/7883187918.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/91159216775.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/hausarbeit_ber_social_media_marketing.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/complete_sentences_worksheet_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c99bd1de-9550-419e-87c9-b056d79b1bc4/lojebibotumiwigikakevofu.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_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 5468 bytes
SHA-256: 3deb887f3ac9a5c0843ef4d999a38fe2fe6549873b78bcdb1d0334bcdf35d3ee
font_01_sfnt_off0000fb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 12036 bytes
SHA-256: 3f4c9054b1fd1ff5563a1f24f8d71e81c0e897227407306594be12928c7ae5bc
font_02_sfnt_off00012274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12274 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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