Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b670fc8bcc8e0e1…

MALICIOUS

PDF

100.6 KB Created: 2021-04-16 02:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ad9f6d5a0a8de7ed38f55ae758da7070 SHA-1: 249c408141eb57a782de2c493afd0a5f47230681 SHA-256: 5b670fc8bcc8e0e13f2380fdcf4b1c39b006bc613a7b470daabebb2f01788264
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document exhibits characteristics of a phishing lure, specifically presenting a fake CAPTCHA to deceive users into performing an action. It contains an external URI pointing to a suspicious domain, which is likely part of the malicious workflow. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://maypoin.ru/strik?utm_term=relative+pronoun+worksheets+6th+grade PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459034/normal_5ff69675d61e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_5fdb5cd36e02f.pdfIn PDF document text
    • http://blognews.top/21759121803vf4kx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452595/normal_5fedb8b191fd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393208/normal_6037756431376.pdfIn PDF document text
    • http://aarbuz.space/saxodavoferovixizoza1y3j2.pdfIn PDF document text
    • http://draiwenstore.online/can_you_have_2_wives_in_sims_4qjpib.pdfIn PDF document text
    • http://gufutaca6.xyz/rilasozumec1ws1.pdfIn PDF document text
    • http://forsage.pw/97063980811rlr3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420459/normal_6069d5c866007.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/67293514555.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/gazamukosixomaji.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_cc6e1e6951cb412ba47e6687cf9bedbd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a04b85c-db72-4a2f-b188-33b85aa98674/1857682150.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/2010_camaro_ss_supercharger_kit.pdfIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_378f8ded4fea477c944f169f2099482f.pdf?index=trueIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_bc193f655659424b9b9b15103d6c5a1a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8464f6d-ba4a-456e-b32b-dfaec5ca6fe0/schwinn_ad2_airdyne_exercise_bike_price.pdfIn PDF document text
    • https://877305ac-a74e-4e93-918f-f866ec7622df.filesusr.com/ugd/0dac30_b70811351c5f4378b906056adf583d29.pdf?index=trueIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_eb2fc0ee848f495e82f43b194403ad5d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a370054-220d-4b74-9b80-75295237255f/81964729512.pdfIn PDF document text
    • https://976edc35-935c-46de-9e6e-e225dbc25668.filesusr.com/ugd/0829d8_7294aaf29801417d849d0231a68ae811.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc33ca16-175a-4e23-97f2-109a3431c86a/joneriravekijunixuzefas.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/16557702652.pdfIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_85e197d68eac4be3a7433128a243b2e5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13016 7264 bytes
SHA-256: 4570e6c36a264a5cc7e7320bd7d56990cc6f7e339ac50a445b69017621596be5
font_01_sfnt_off000148a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A8 5600 bytes
SHA-256: 89650bc4132761b88a8c61fe9db864a60c4cd12989295ef32e7524535b25e2d4
font_02_sfnt_off00015bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD2 11852 bytes
SHA-256: e348c2e669a6b9e8ea51a67c8309686dd74cd2da4ec697f8be87f273d46fb1d3

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