Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ca768f6c82ffcc…

MALICIOUS

PDF

76.0 KB Created: 2021-03-11 20:37:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 44c1e91e73a5db1d8c2dfef7a65d0065 SHA-1: 7c9437ece2f0bdfd5d84747c66db2384464f5b3a SHA-256: e8ca768f6c82ffcc904bc1c925d4b5ce1727c0205b615682da8b2981f9111d3c
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of external URIs and a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'small pdf resize' and 'download', aligning with a lure to download a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/award?keyword=small+pdf+resize PDF link annotation
    • http://cashbackmoney.info/210973584097lo4y.pdfIn PDF document text
    • http://prognoz-football.club/il_est_probable_que_subjonctif_ou_ina7vo9.pdfIn PDF document text
    • http://cetakchantek.com/update_windows_10_version_1803bu72b.pdfIn PDF document text
    • http://sallles.ru/74855003981793md.pdfIn PDF document text
    • http://procripton.com/fuwububyk2d7.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/d381ia0/laxisuwewodobikibojaxaw.pdfIn PDF document text
    • http://winoraama.fun/54418399543jgzs1.pdfIn PDF document text
    • http://animoney.xyz/google_sheets_vlookup_return_multiple_matchesc8fya.pdfIn PDF document text
    • http://instasurprise.online/19865876313j1jqy.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/fjDieJb/nipaviduk.pdfIn PDF document text
    • http://metryck.info/160182578237xo3.pdfIn PDF document text
    • http://usacreditreport.info/nys_road_test_scoring_2020vap3o.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/uiUSicR/ninja_blade_xbox_360_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/taxotuzu/hhh9hdj/jubegajuriwik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_3719a76e5ee545c28c892f377e317e18.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/junudo.pdfIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_37b3e97385f1494dbb855127be7ac582.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/35658443427.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_ae99ecdfe03147d09d4926946f30982e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/murudute/kemevoxogedemakuwujugi.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/amma_sandaki_song_lyrics.pdfIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_bbd9c1c33889412d96c12147f782ac88.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_0e3d8ac5cbee4a26b6f07e7e971d5609.pdf?index=trueIn 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_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 5340 bytes
SHA-256: 506eb901d325338b3a83a925b0a270a354081b90deb5534c38cdf0ae93c8cea2
font_01_sfnt_off0000feba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBA 10516 bytes
SHA-256: 7d1d12a6bed5d724f89dcce7c9399dd865264236729638ff6b69e35fd85b576d

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