Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed04c106f27bebc…

MALICIOUS

PDF

69.3 KB Created: 2021-01-21 05:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a80618d53db9c932b5021f3f20073bc0 SHA-1: b2f53a2427dff9276955b2661046dd04a60d2f24 SHA-256: fed04c106f27bebc026abefda31a2d252e0ebf9827621f76d0fd328f1c89bf47
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. One prominent URL, https://jottigo.ru/wb?keyword=mice%20running%20around%20my%20house, is directly embedded. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a malicious intent, likely to redirect users to malicious websites or download further payloads. The ClamAV detection and ML classifier strongly support its malicious nature.

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://jottigo.ru/wb?keyword=mice%20running%20around%20my%20house PDF link annotation
    • https://semufukat.weebly.com/uploads/1/3/1/8/131857602/nazesotijifeme.pdfIn PDF document text
    • https://dadizatutelebi.weebly.com/uploads/1/3/1/0/131070904/5647867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_5fc348d648598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480595/normal_5fc2f420a9699.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380543/normal_6008416942f76.pdfIn PDF document text
    • https://tedisizizifem.weebly.com/uploads/1/3/4/2/134235801/6019168.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/3905313.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485926/normal_5fc455eb51499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f871bb53af6c.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/gezetega/24145406650.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/cognos_active_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/arabic_hebrew_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/afd_allgemeine_informationen.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/animal_crossing_city_folk_shoe_style_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/pierre_bordage_nouvelle_vie.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/nostalgia_ultra_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/aaron_neville_album_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/rapafikovudutubomes.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 5428 bytes
SHA-256: a3efd265dd0d94c78a4c17d61cbb6ced415d8820c94510bbd73b963472c8a630
font_01_sfnt_off0000e0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BD 11444 bytes
SHA-256: 92a65ca8baf0833c98781743c24871db4771d0cc73feeb098616e15dcf3e0f99

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