Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ee5c6c0cdee0b2…

MALICIOUS

PDF

81.1 KB Created: 2021-03-24 01:11:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6e860b72bd47dc507540d6fe478a779c SHA-1: 98c00024c159220b368a4f758f25310ce9fd2b3f SHA-256: 27ee5c6c0cdee0b2af043d5c5d3598674c78378b44272876fb9a609993bdb208
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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.
  • 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://nipisod.ru/wix?keyword=conservatism+ap+euro PDF link annotation
    • https://poxagubojawi.weebly.com/uploads/1/3/1/4/131482812/nedidovizafafako.pdfIn PDF document text
    • https://revevapeseguv.weebly.com/uploads/1/3/5/3/135387876/lonekop.pdfIn PDF document text
    • https://texanajak.weebly.com/uploads/1/3/4/0/134018539/1703643.pdfIn PDF document text
    • https://ruvatekokero.weebly.com/uploads/1/3/1/4/131437102/gefemedofikurixolu.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/riflMjf/quiz_of_knowledge_2020_free_game.pdfIn PDF document text
    • https://vebeviwikime.weebly.com/uploads/1/3/4/3/134317270/9ea9fe4c93.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/dXngehh/puxijidejafefelipux.pdfIn PDF document text
    • https://buvefejam.weebly.com/uploads/1/3/1/4/131453018/regokazodu-wegevixuboge-mozobakum-wozanimobid.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/ggmiabH/35791726524.pdfIn PDF document text
    • https://giravegide.weebly.com/uploads/1/3/2/6/132681237/48fb0f15349eacc.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/bqtjggd/71045286843.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9e8df79-8ce8-4c11-b3dd-40db50df72b3/wegipavirofudeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5655b492-d7be-4d28-8c88-0c648d9d8bd8/what_is_a_self_destructive_person.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/arjun_patiala_video_song_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92794f5c-f516-46d8-b319-a97d3fff9821/82055485017.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/92311123796.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/cercle_de_la_forme_centre_pompidou.pdfIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_e21a17e4bbd741d8a6e1e9b3a0e747d6.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_ab3134fea8f54a1c81a874112b9cf44c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23aeae99-bfa2-4880-8f63-994ded00d260/xivujofasebukonebules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeaff7a3-d333-44ed-916b-acb88f192547/p938_vs_p365_size_comparison.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 4896 bytes
SHA-256: 815e3e5cd5637cf3075f374f985925b811c9635224a0427f286c70d76c5fffd5
font_01_sfnt_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 4740 bytes
SHA-256: d29f53e834d81788038045e404d9410cbc6b67fab92c3d611eb681f8ac52e76e
font_02_sfnt_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 10600 bytes
SHA-256: 2990aa536890b9bc234581c06d8449707dca4fa7c5881719520920376b5e2559
font_03_sfnt_off000120a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A9 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1