Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41022940456bd01…

MALICIOUS

PDF

89.8 KB Created: 2021-04-25 06:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c8f1297f3581aa9893a43086777be015 SHA-1: 512e37c4a0083ed806e8ce19492863cb5b63e41f SHA-256: c41022940456bd01b0a161dc3dafddbe7bc5154903bf3cbcbf0d8ef0ad3ec847
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9983

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://pelibifir.ru/strik?utm_term=a+court+of+thorns+and+roses+book+3.5 PDF link annotation
    • https://cdn.sqhk.co/jugemito/wHyYge3/ramenoxezo.pdfIn PDF document text
    • http://richmaya.site/babli_badmaash_songjulkg.pdfIn PDF document text
    • http://yesstore.pro/zuzalixetobivufapaloxa3bcsx.pdfIn PDF document text
    • http://winoorama.fun/homelite_electric_pole_chain_saw_ut43160dpmtf.pdfIn PDF document text
    • http://hugertely.xyz/sherlock_season_3_episode_2iifce.pdfIn PDF document text
    • https://cdn.sqhk.co/kuniremolu/gcjcrUB/top_10_rpg_online_games_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/ehfhjIM/wejitizotibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_6036d253bec82.pdfIn PDF document text
    • https://cdn.sqhk.co/firokizita/euhdyi5/61594869064.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/nondestructive_testing_handbook_volume_7_ultrasonic_testingnq5an.pdfIn PDF document text
    • http://ladyso.ru/johnson_9.9_4_stroke_oil_changejgf5v.pdfIn PDF document text
    • https://cdn.sqhk.co/lutakakijuro/gjEUjhp/nolesareta.pdfIn PDF document text
    • http://tryraisins.club/fodatinamiritusomusuxunab4omk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489050/normal_5fc680223d453.pdfIn PDF document text
    • http://capridigi.com/89439987804vdmuq.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
    • https://uploads.strikinglycdn.com/files/ed35b6a9-4d95-4ea6-b19b-0d2bc5d8a315/gutenofufadeve.pdfIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_e90197025b01490ebe09f35967a0e543.pdf?index=trueIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_f5f979caf6374418a111f16d09797d0e.pdf?index=trueIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_23f16d41219442ee9dcbe31504de9c13.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5bd29ac-441c-4242-b2c7-3ad0ed5725af/canadian_penny_stocks_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/476eac6d-0196-4fc7-937a-bba9d4c24d12/xedizuxakujanoridajaje.pdfIn PDF document text
    • https://3f7ff619-1e23-491c-a925-ddda4d79b49c.filesusr.com/ugd/79c22a_952e7fb6d938423c80815f7e85ef54f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c60a1fa-8826-497d-b740-b52c18a1ee1e/rinitasesikemotitoruvup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/574eecf4-a94e-4466-aed5-c2be620668b9/bivegawomamurosudopawa.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10264 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off00011258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11258 5424 bytes
SHA-256: 1f08745dc9ebff6f359f8ccc5d56fc480d9cc833c54a8f10e05453b8738cf15a
font_02_sfnt_off000124b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B9 11236 bytes
SHA-256: 52fefef97577227d77ba8082d551828b6d51d015983690bef763c5bcd37b7c51
font_03_sfnt_off00014b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B08 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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