Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59b6bc68518b676…

MALICIOUS

PDF

74.6 KB Created: 2020-12-17 21:26:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c4175febc1f0ddeebdb07885f84f2527 SHA-1: 153f27f6b647dd1275180dd84c697a3a6268f209 SHA-256: f59b6bc68518b6764010ad867b6d4146a43dc0f48af4bbd04e533eb9cbcd827a
214 Risk Score

Malware Insights

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

The PDF contains multiple links, with one specifically pointing to a redirector URL that appears to be part of a phishing or malware distribution scheme, as indicated by the 'ggtraff.ru' domain and the 'download apk blackberry messenger' UTM parameter. The presence of a large number of external PDF links, some pointing to Weebly hosted files, suggests a link farm or content manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/strik?utm_term=download+apk+blackberry+messenger In PDF document text
    • https://vepiduworubul.weebly.com/uploads/1/3/4/7/134723348/wibife.pdfIn PDF document text
    • https://kuvanipugeva.weebly.com/uploads/1/3/4/4/134445248/narinofol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413458/normal_5f9500df5ef8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_5fa285c00be07.pdfIn PDF document text
    • https://dogirewepa.weebly.com/uploads/1/3/1/8/131856222/9e1b0.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/vezumobigodub/dan_duchaine_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd916b4-9d27-4bc3-b417-b73eea5bfb25/4052049369.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/61389111832.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/calcium_metabolism.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbffe61bf71053ccb0b2b06/t/5fc1569aa97599144e296611/1606506140777/36798598126.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1d2da12facd59ceb37db7/t/5fc7a38ca907d7439ce17e10/1606919052538/mint_launcher_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c362403f5353fd950a5e/t/5fd07c158f1ddd5ccbde14db/1607498778195/anime_high_school_simulator_mod_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1012fe5c7695ca99c31f6/t/5fc1585c4e98326c024273ca/1606506590585/jepowe.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_off0000cc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC00 5788 bytes
SHA-256: 704c25ed08d1e990cfbb4f5a950a30c0e4a51eaf6f77a51766ad7b9636dc6849
font_01_sfnt_off0000dfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 10824 bytes
SHA-256: dd26537b5f95eb77ac432699d116915560861bf71773f153c954e1fa2755a5ee
font_02_sfnt_off0001047b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 16568 bytes
SHA-256: 8fbfd768f908e556a7ae752e9f1c4914eb88e31752713b1efd7826132f7b4b79

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