Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1033506fd653030…

MALICIOUS

PDF

81.4 KB Created: 2021-03-29 00:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1820d162bbc1b3b23a98d31bae487bd SHA-1: ddedd05f0f610f7cd703a45df034543fcd351153 SHA-256: a1033506fd653030e5227c7577199eedf20c1d007c413d2788c69f40af324041
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with a primary suspicious URL pointing to a domain associated with SEO spam or phishing. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to educational content, likely to mask the malicious intent of redirecting users to the identified suspicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/wix?keyword=the+nitrogen+cycle+worksheet
    • https://cdn.sqhk.co/bukevexej/gahb8ji/totally_accurate_battle_simulator_pokemon.pdf
    • http://ylyn.ru/89871432809rz1bv.pdf
    • http://akb54.ru/posiwidibuperisuxuxede4o1dg.pdf
    • http://keto-menu.online/bujagiponr01f9.pdf
    • http://pixxel.life/how_to_fix_a_saxophone_leakqpuc9.pdf
    • https://cdn.sqhk.co/givifevulo/if69ihS/iowa_farmer_today_subscription.pdf
    • http://pressit.fun/harbourvest_global_private_equity_ltd_annual_reportsbom7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e41565f5-39e7-45f4-94f9-ed50f119311e/38479819939.pdf
    • https://uploads.strikinglycdn.com/files/a2863b64-6b9d-41cb-a35a-a585b88ac7c8/how_much_does_a_cashier_at_lowes_make.pdf
    • https://uploads.strikinglycdn.com/files/245f9624-d3a7-40ba-a24e-ac38e732592e/stc-1000_keezer_wiring.pdf
    • https://uploads.strikinglycdn.com/files/944c6281-906f-4656-9632-a4aa42533b21/dopubokugipofimiwajemite.pdf
    • https://uploads.strikinglycdn.com/files/8faea96c-80bf-469e-a925-c98e9f8c39a1/59674252810.pdf
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_e6322198df7147eeb87143182aad5573.pdf?index=true
    • https://uploads.strikinglycdn.com/files/35dff96d-e543-4507-ad6b-ea4d489ad91c/buvoda.pdf
    • https://uploads.strikinglycdn.com/files/18898bee-2d1a-4906-860d-e2db613f1bac/bipiwifejodatel.pdf
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_5652949a9f8e4654a07cf47f6bac102a.pdf?index=true
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_bde3df8a79a94dfab1beef2e2e15d190.pdf?index=true
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_562d0b3f7cb34ed8afafc1e22d47c125.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4dd.bin
ac8bce68628fa6d27f453fc58bc12869669a2eee0fb4cca5bad3476f423e668c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 4844 bytes
font_01_sfnt_off00010565.bin
78c377dddf089f9a94fdfcbb1d70c3d41e510e445eb2f6cd3cad4cd64f13bd52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 10764 bytes
font_02_sfnt_off00012a58.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A58 4324 bytes

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