Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc80f491eaefeb8…

MALICIOUS

PDF

67.9 KB Created: 2021-03-27 15:10:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c89cabe2607adcbf537f79199ea1df37 SHA-1: b1fb573a6825ed60d061496e9fa259435212d872 SHA-256: 5fc80f491eaefeb86c7c2cb6d9f019c06c4f4bd013643c8a36bd68db3d201b66
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, a common technique for SEO manipulation or distributing malicious payloads. Heuristics indicate a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=dymo+labelmanager+160+guide PDF link annotation
    • http://gutprod.xyz/nevuzavuzasamutejamoxg6vb.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/cgiq9oV/funny_riddles_quiz_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/fakosopalo/1ibTibY/auto_clicker_no_download_needed.pdfIn PDF document text
    • http://skidki-day.store/harry_potter_2021_lego_leaksbrruy.pdfIn PDF document text
    • https://cdn.sqhk.co/mogilirexexa/yG65kge/foralibudaguxux.pdfIn PDF document text
    • http://ronojalad.22web.org/9767208726.pdfIn PDF document text
    • https://bemafaparad.weebly.com/uploads/1/3/2/6/132681832/4073762.pdfIn PDF document text
    • https://cdn.sqhk.co/muzubasiwu/0gcjfgg/8119233817.pdfIn PDF document text
    • https://lemefiware.weebly.com/uploads/1/3/4/0/134017231/8255713.pdfIn PDF document text
    • http://madamzero.com/nomerajiv5kkwz.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/biggfYj/momezikugeluzewux.pdfIn PDF document text
    • http://mpvideo.org/atwood_rv_furnace_limit_switch_locationvpxee.pdfIn PDF document text
    • http://puxeguka.iblogger.org/43443408575.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/NhgvuWb/bejupeximabujofozanog.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/ditak-xudirowa.pdfIn PDF document text
    • https://cdn.sqhk.co/sofaxuleruri/RFp9Z2E/58920667153.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwolegu/vt9ifRv/tap_music_3d_hardest_song.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/tobito/microsoft_sharepoint_server_2013_end_of_support.pdfIn PDF document text
    • http://nabifasilazug.rf.gd/cakewalk_pro_audio_8_manual.pdfIn PDF document text
    • http://memekafese.rf.gd/kegifuzusigefibidewi.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/27546117613.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/bilakov.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_off0000c9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C8 5556 bytes
SHA-256: cc0887a33aa720877be161ae9d7567c8e06c5194f6c33f770f37cfa67a81e603
font_01_sfnt_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 10568 bytes
SHA-256: 29800b86ca536fb8cd0fce883cb83c4ffaa4201aa6883d6e5f0869548f546b5e

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