Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e27bb90d2c7664…

MALICIOUS

PDF

77.7 KB Created: 2021-03-31 13:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 69345d2bb839821e81182a3178496c51 SHA-1: 9cb34b007c4791144ab597ba20ca5376513ac85e SHA-256: e5e27bb90d2c7664bcdbdb8336893254b6f343f5b84755223ebac8a6829d7b66
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 0.9996

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://ponafet.ru/123?utm_term=picsart+editing+video++hd PDF link annotation
    • https://cdn.sqhk.co/wokiwife/ghahJTv/13624518051.pdfIn PDF document text
    • https://cdn.sqhk.co/radojiga/5hjhjj4/marshmallow_root_extract.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/jepnjia/tukovozoxijipifotemesa.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/6VQz9Zy/neo_scavenger_map_locations.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/gghdzJx/34103746216.pdfIn PDF document text
    • https://cdn.sqhk.co/gimowiboxero/c4dOdbU/bot_command_discord_music.pdfIn PDF document text
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/kexezarafi_bezalabuxato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_6023b93a0b302.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406514/normal_5fc6a6498fe13.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/dhcRijC/personal_emergency_alarm_for_elderly.pdfIn PDF document text
    • https://jotovaxawunujej.weebly.com/uploads/1/3/1/8/131856347/3affbd.pdfIn PDF document text
    • https://cdn.sqhk.co/zixapegof/IgcheNO/used_yellow_kia_soul_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/tetolonul/hd3lhdg/spinosaurus_size_to_human.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_398c1f5e142444ce84f9fbc4e68e5722.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/620ea059-2677-41eb-81e3-07d5bc1036fb/varolewefeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bbb7b47-7669-4044-b684-97f35b0aecb0/vabefaremaxigulu.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_8a1b28ce320e444aa4398f88f9a70d91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e47f5aba-94d4-487d-8fff-492fa1759e22/seat_of_the_soul_institute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef00192a-ea2c-4677-a111-78f1cbdee44c/livros_espiritas_infantil_para_baixar.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_30ebd4b34ef64ca68205cf3f21039c98.pdf?index=trueIn PDF document text
    • https://e72deea9-3c4d-48de-8429-d2e8e2d5d9b3.filesusr.com/ugd/68b2df_1745024737c343e29bd9b53cda32f83e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36873c70-9a61-4b92-807b-cc34760e4096/ge_profile_microwave_touch_panel_not_working.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_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 5232 bytes
SHA-256: b000491324e07886e7b4b1c8a52caff99f85cf78642c545fa0ac1c2ad36673aa
font_01_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 10780 bytes
SHA-256: a71e0f42707e55fea90a1e9bbbe18467d1bfcac57f5c11e0a7947b308f1cbc45