Malicious PDF — malware analysis report

Static analysis result for SHA-256 8577cc354b682adc…

MALICIOUS

PDF

82.7 KB Created: 2021-05-21 15:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fcbb47d297194f8d51804463c0419377 SHA-1: 8f557617d0a850b61283d34ebc4f73c2d3322c60 SHA-256: 8577cc354b682adc0aeb62cbdbc775bb1f9d739b47e91ed342396a3182290b0d
216 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including brand-impersonation credential phishing (UPS) and a link farm. The embedded URLs point to redirectors and phishing pages, suggesting an attempt to trick users into providing credentials or downloading further malware. While no scripts were explicitly extracted, the PDF structure and heuristics indicate a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://kapiromus.weebly.com/uploads/1/3/5/3/135345701/1a209902e63b1c.pdf.
  • 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://vilenefex.ru/strik?utm_term=bloons+td+battles+hack+free+download PDF link annotation
    • https://kapiromus.weebly.com/uploads/1/3/5/3/135345701/1a209902e63b1c.pdfIn PDF document text
    • https://fotavisemaro.weebly.com/uploads/1/3/1/4/131406710/sazodetimuwixekam.pdfIn PDF document text
    • https://dukuvelawabuze.weebly.com/uploads/1/3/0/9/130969723/vewuxowekisu.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/mizis_lokexirojezuwop.pdfIn PDF document text
    • https://lirodute.weebly.com/uploads/1/3/1/8/131871659/digebufowojodogenef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b0f9054-85f4-44ad-bf12-7dfdab5ce870/the_gay_science_nietzsche_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f96a239-6ed9-45d8-91a8-1a6b32869777/28116179347.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/31702529855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e78ce754-11c2-4b24-a11b-e00bc7afe706/free_english_conversation_classes_melbourne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c76a951-b72e-4c85-bb0b-e368db685ef8/39941958469.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/balloon_games_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/cambridge_international_students_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b76b1243-ab25-409f-b2bf-0c4d94ddb200/jonomanebekid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/847cd40c-7b8a-4b74-b9d9-4dc6535811f4/sedikigapa.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/god_of_war_3_trophy_guide_collectibles.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/710626997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a45f7e-dd2c-46e1-a684-e884c0a4cc2c/why_do_you_think_the_urea_was_not_able_to_diffuse_through.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/lazexuvixokuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b66717-b51a-41dd-b544-d4056bce7c95/can_you_build_muscle_just_doing_bodyweight_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7556d5fd-3a97-4c3f-8341-328a1d4850ef/25194753001.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/10726108049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f7f18ca-2c54-4979-9869-8333355cbda2/escuela_de_guitarra_clasica_online.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/how_to_use_lowrance_elite_5ti.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/anuraga_karikkin_vellam_full_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3983bdae-9099-48f1-a380-531efd13463e/84499832846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d3f33b2-2170-4024-a766-1ce49787ae91/john_paul_jackson_family_pictures.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 5452 bytes
SHA-256: ca9f66558647633de8b1b070f9ab1a1e8d55881a554d4d5ddb96504b4bda6ad2
font_01_sfnt_off00011722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11722 11180 bytes
SHA-256: 8179441a0bf4938acd5aff358bdece5c4f94f22dcb2e853c9b80a131fc77986f

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