Malicious PDF — malware analysis report

Static analysis result for SHA-256 950457860103128d…

MALICIOUS

PDF

80.5 KB Created: 2021-03-16 18:18:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8577753105a24c1ea6fb050e178a6ada SHA-1: 5d24c2ce0321c3b94331a5ae115839df8a61eb7d SHA-256: 950457860103128d5307856329b19ce737f203c6541f9215f5e87c235565d9ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9994

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 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://bologen.ru/wix?keyword=example+catholic+confirmation+letter+from+parent+to+child PDF link annotation
    • http://samoe-samaya.ru/76552474308h34s6.pdfIn PDF document text
    • http://bottlechainworld.com/frsky_qx7_manualjwje7.pdfIn PDF document text
    • http://inter-kalinka.ru/android_alarmmanager_source_codes3y2z.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/what_does_the_term_bogey_mean.pdfIn PDF document text
    • http://autocredit.moscow/baritone_ukulele_chords_chart13g2v.pdfIn PDF document text
    • http://bcipreactivaperu.com/peavey_vypyr_vip_1_bass_reviewhnnnr.pdfIn PDF document text
    • http://zifasito.22web.org/samsung_galaxy_note_4_cases_australia.pdfIn PDF document text
    • http://merotudonor.mypressonline.com/what_does_visual_culture_include.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/894d957f-9245-442c-8b1d-4f6a785dd589/7814656959.pdfIn PDF document text
    • http://nerezusilanake.atwebpages.com/lenovo_g50-80_screen_replacement.pdfIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_719098564cb44c56841c15528d590222.pdf?index=trueIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_0298ed10cea1440bb45c4e06c8884bfd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ee97d71-28d1-4ffa-991f-382027bcb744/honda_rancher_350_oil_type.pdfIn PDF document text
    • http://gamupuzif.epizy.com/xolotabisofubusafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea84531b-31fd-4ee5-aeca-d51e1a35a8f4/how_to_save_final_cut_pro_video_as_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf935002-295f-40af-a461-b74cc30c068c/ubuntu_free_download_32_bit.pdfIn PDF document text
    • http://redifigikutusoj.myartsonline.com/panchatantra_stories_sanskrit.pdfIn PDF document text
    • http://begokev.epizy.com/what_is_the_meaning_of_the_word_common_knowledge.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/bunitoviborowigedi.pdfIn PDF document text
    • http://sewoxoxitif.rf.gd/kafefiguwexokak.pdfIn PDF document text
    • http://piwisivajefi.rf.gd/85024854137.pdfIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_ea11682d90824c83940316cc355ad1f9.pdf?index=trueIn PDF document text
    • http://bigapenegig.atwebpages.com/big_ideas_math_algebra_1.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_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 5244 bytes
SHA-256: 72b9aca68f390b6a90eab4dce4d2c1d04b070303e117c9819164a6e40a5481f4
font_01_sfnt_off000111ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AB 10132 bytes
SHA-256: a0006b5ba71b9fd81be889dc8ec1c7b14af8bec0114dc951cc7c971b2d9026b3