Malicious PDF — malware analysis report

Static analysis result for SHA-256 319dbd559ce3adbe…

MALICIOUS

PDF

74.0 KB Created: 2020-12-17 21:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2322c3810e7fd2036c1f8abe5f133a78 SHA-1: 7abde7ed55b6a5a78cb139c1757c5bc75c61082a SHA-256: 319dbd559ce3adbeadc9c515ce301353bfa8f165c10ef6d4c1e7a4ead9bb3176
184 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains fragments suggesting a lure related to a 'street chaser game apk', which is likely a pretext to drive users to the malicious URL.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=street+chaser+game++apk In PDF document text
    • https://zikavudosun.weebly.com/uploads/1/3/4/3/134329779/ccf8ac29713.pdfIn PDF document text
    • https://biduvokiket.weebly.com/uploads/1/3/4/3/134367510/ruxovarab_zesagexipeva_nuwonelawabob.pdfIn PDF document text
    • https://zanorima.weebly.com/uploads/1/3/4/6/134624551/6428611.pdfIn PDF document text
    • https://kumaneke.weebly.com/uploads/1/3/4/6/134682587/fubozerujikexika.pdfIn PDF document text
    • https://gefojepedawe.weebly.com/uploads/1/3/4/4/134478994/lodegedibolujon.pdfIn PDF document text
    • https://xosuloduviz.weebly.com/uploads/1/3/4/8/134890731/ffefc7a4fb6b.pdfIn PDF document text
    • https://bulakivu.weebly.com/uploads/1/3/4/8/134877285/niselixedolanes.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/tonisefoteka/call_blocker_for_android_2._1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b51bd44f-c086-423b-b00b-38aa08de1fcf/97645922551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08967add-62ee-4adf-8198-622a0bc9ef2b/98360650986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0bd6c9-65d1-4632-b507-9999b3ec9069/trollface_quest_unblocked_weebly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6dd9492-7322-4659-a80c-6172c8f2ebed/33217668637.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4dfad403f5353fdaf152a/t/5fcacfb585bc3a28a6fce73e/1607126966938/rafexafadaregurafadamir.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_off0000cd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD04 5480 bytes
SHA-256: c53bc19e31c679f28e787e751b1f64d423ee75ca991159a4967548589d91c0b7
font_01_sfnt_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 10336 bytes
SHA-256: 40417678bc593595b4c801688cced1949d77772edcef1179f1dd5fc70cc8c060
font_02_sfnt_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 16836 bytes
SHA-256: 754be12199a0237c92180e7dfe9f340e7d71bb1f2521ae31271c8592f5e574b5

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