Malicious PDF — malware analysis report

Static analysis result for SHA-256 8658bb12ffb64381…

MALICIOUS

PDF

91.1 KB Created: 2021-02-15 10:55:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 532b2b5226ebd8a3a6c71ce07ea4e459 SHA-1: 2cb182a4e0ffce99854254ab98c5b2d0957e430a SHA-256: 8658bb12ffb64381f6763dd8b69527eeecf2d1617872351e4813d00c8bc3fbaf
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 0.9997

Heuristics 5

  • 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 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://druttle.ru/123?utm_term=rancilio+silvia+v1+parts+diagram PDF link annotation
    • http://converstarget.ru/payaliya_bajni_lado_piya_song_audioqcmbo.pdfIn PDF document text
    • https://cdn.sqhk.co/ferudati/tjd1ieX/grow_tower_castle_defense_mod_apk.pdfIn PDF document text
    • http://webpost.pro/revenger_x_vape_coil_changedyeub.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/hCugjWj/60492708722.pdfIn PDF document text
    • http://tubezadobuzaro.66ghz.com/gipiludujurifu.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/j1OVdjc/electricity_bill_calculator_excel_template.pdfIn PDF document text
    • https://felelitujafi.weebly.com/uploads/1/3/5/3/135392562/5342333.pdfIn PDF document text
    • http://healthytrands.com/homework_3_transformations_graphing_absolute_value_functions_from_vertex_form_answer_keynzo0g.pdfIn PDF document text
    • http://damvglaz6.xyz/76062342154h1rgi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lugegurofeso.epizy.com/xezofezonamod.pdfIn PDF document text
    • http://tabifewegijip.epizy.com/fellow_eternal_clash_game_guide.pdfIn PDF document text
    • http://fuzimobikuxuta.epizy.com/20232065600.pdfIn PDF document text
    • http://luruloligof.rf.gd/97377080098.pdfIn PDF document text
    • http://tisoparumunezud.epizy.com/bluetooth_microphone_for_iphone.pdfIn PDF document text
    • http://samanoniminowut.epizy.com/bhojpuri_video_song_thik_hai.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C71 5184 bytes
SHA-256: eb71b0deeda93da0adc7edafbc061d04155bd120d88e61b50bf1a7bab3d16874
font_01_sfnt_off00012dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFD 10272 bytes
SHA-256: 939bc2327b20c0ae2cb4df078529903fca5b17cb511712c5a2a6431525d19411
font_02_sfnt_off0001513f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1513F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c