Malicious PDF — malware analysis report

Static analysis result for SHA-256 13176cc31ff23e13…

MALICIOUS

PDF

74.8 KB Created: 2020-11-18 18:13:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ff30cefc222b05f1270a72dff236ae7b SHA-1: 11fd95a9ff2c762d13cd3714fdc116f367e57ba8 SHA-256: 13176cc31ff23e1369bbae981bf0c5d38cc72ac56720642ff97e00d74df049cd
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm with numerous external PDF links, one of which is a suspicious URL hosted on 'trafficel.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to a malicious site.

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
  • 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://trafficel.ru/strik?utm_term=qcy+q29+pro+manual+espa%25C3%25B1ol PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369505/normal_5fa0b1fddd71e.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/kekikefuwu.pdfIn PDF document text
    • https://wabozejitikaz.weebly.com/uploads/1/3/4/4/134495441/1879101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385010/normal_5f937e44e53ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470532/normal_5fada3a85922e.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/5d157e2a-6dc4-4a34-ba8f-1e09fdfda963/post_malone_pendleton_july_13_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/guitar_open_chords_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dab316e-ebf3-40e8-9a73-8c81a04bba32/kugog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/701b8cee-a512-488b-8873-5abf8bb4f3aa/finutovaled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cf2362b-95e0-4cb7-bf93-b0cd731bb440/20770777593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4631b5ec-42d0-43b9-ace5-bc7eab9c5c02/i_can_t_edit_my_google_site.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/034b98e4-6fe5-4b81-abef-a5b09416b7ef/cardiovascular_physiology_concepts.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD05 5868 bytes
SHA-256: 154ffe43d11f39cb97cf8c8ee233b20aa39eb6117260641243360cfdf46c5efb
font_01_sfnt_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 10308 bytes
SHA-256: 170731105c8c42803e82e22e561f1829d714cc8edc8f53bb9cb0ce985eaa2c1e
font_02_sfnt_off00010423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 16964 bytes
SHA-256: 4f36d9158cc24b6ca1dce0014dbd738cefd4837a87c5a24e6269a105cec97546

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