Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed457ba3a1b56617…

MALICIOUS

PDF

81.3 KB Created: 2020-12-20 23:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4ae8449d0e049c05de3cf0685ef5828e SHA-1: 60953c5cd2f62926e349c262e993dd06247934bd SHA-256: ed457ba3a1b56617cf2349169ecda1abfb3af69b896484500cb46b1a5fef1f1e
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'traffking.ru'. This URL is likely used to lure users into downloading further malware or phishing for credentials. The PDF also contains a large number of external links, many of which are to PDFs hosted on S3 buckets, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://traffking.ru/strik?utm_term=unblocked+games+76+earn+to+die+2012 In PDF document text
    • https://xowazusutimu.weebly.com/uploads/1/3/4/8/134880561/baledape.pdfIn PDF document text
    • https://wizejuxexena.weebly.com/uploads/1/3/4/6/134655833/fedepa-rusadi.pdfIn PDF document text
    • https://mulovepo.weebly.com/uploads/1/3/4/6/134666579/207e903470.pdfIn PDF document text
    • https://kezagoguz.weebly.com/uploads/1/3/4/1/134131769/835370.pdfIn PDF document text
    • https://zojopufowe.weebly.com/uploads/1/3/4/5/134523349/f48e93ec68.pdfIn PDF document text
    • https://xufizigox.weebly.com/uploads/1/3/4/4/134479456/xaviz-tagalesapubalof-gixopatas-jufuzipuxukabu.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/jemisajoda/comprehension_worksheet_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/gazabizumiwuzofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f874c87-4dd9-4373-b674-23f987772164/defiant_indoor_timer_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/90770916932.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/yoshino_s_blackstone_fresno.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc319ba3dfdd95b60e373eb/t/5fc568bc3485235c867cd5a4/1606772924690/android_1_gta_5_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59ae9369-376a-4330-adec-5a2fb64bf00c/51205534935.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/leziked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/942d8e67-6df1-4135-8ed5-ac086f256b5a/gevunomu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011360.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11360 21120 bytes
SHA-256: cca011016ef84dbc95f8dfeef274285bc9841c91f00cf66cfbce1e60873ae39a
font_00_sfnt_off0000d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 6012 bytes
SHA-256: c1507ab08f8e1fc3b08c3f8ed53fa7e7e0fdf617a56f711c25e6c7e459448305
font_01_sfnt_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 10720 bytes
SHA-256: d0d1e73cb621842097fc0f65b46fb9d81d5f4546e82bd4d6ef338436a4dc520c

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