Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a71e8d6ff50eb1…

MALICIOUS

PDF

74.7 KB Created: 2020-12-17 07:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ea704469581b2953c22c1d2cb2f7426d SHA-1: b2d3545b0cc97edbdec033506e7b46a8fad5203b SHA-256: c5a71e8d6ff50eb1395ad012bda62b881e7ccbed68f5ad0af1125b671f2a4cb9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. One of the external URLs, 'https://trafficel.ru/123?utm_term=antena+tv+apk+mirror', is directly referenced. ClamAV also detected this file as 'Pdf.Phishing.Trojan', indicating a malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the ClamAV detection strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=antena+tv+apk+mirror PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414869/normal_5fd35944ae47f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493873/normal_5fbec5b182522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455642/normal_5fb60ddcddf73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5f924b571e8d7.pdfIn PDF document text
    • https://wazeketarawowaw.weebly.com/uploads/1/3/4/5/134587567/wulididofalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373985/normal_5f9a5d4d1dcc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393762/normal_5fc9b27a3d0cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_5f9673cb3fb17.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/1082002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414849/normal_5fafe310e6b78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5fdaa93dcb63a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417527/normal_5fc597c41725a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372355/normal_5f8ab2f7477b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://static1.squarespace.com/static/5fc64468403f5353fdba117f/t/5fd60b36491a58544a071df6/1607863095729/sepsis_neonatus_adalah.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd06d36a371610b878b62f/1606223571997/pixel_gun_3d_hack_pgun.net.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c44cf0d-30b9-4785-a809-eece74c0b0f4/zilozi.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC490 4868 bytes
SHA-256: 95d50e4a10bac55ca6842a2ae059382f42e250746c44eac13e7bddaa2008840e
font_01_sfnt_off0000d511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD511 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0000e074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 10408 bytes
SHA-256: 4d18eaa2d2c25be3590fb58c04bd1c4d53766f5938f05bdee16f74268926d9e8
font_03_sfnt_off00010437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10437 7508 bytes
SHA-256: d09b2fd44e1d2a3082d5956f1e98a8d06f7bc4244564ad5c8e7137774de77127

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