Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef780257a19f3481…

MALICIOUS

PDF

75.4 KB Created: 2021-03-30 16:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0307991a5badc68e9dbd8a520abfa0ef SHA-1: bda791aa47fc6880c7fc8e38766612a1da6db54b SHA-256: ef780257a19f34814a9a61f8767005b885295343cc69e6e91c81d8e200259fbb
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 0.9997

Heuristics 5

  • 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.
  • 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://botokaw.ru/wix?keyword=como+se+clasifican+los+triangulos+de+acuerdo+a+sus+angulos PDF link annotation
    • http://ita-bio.space/xagojewub00ha.pdfIn PDF document text
    • http://expressvpn.store/4468558221240lfc.pdfIn PDF document text
    • http://dopezonuj.iblogger.org/how_to_praise_poetry_in_english.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://ritikutoxukor.22web.org/harry_potter_book_wikia.pdfIn PDF document text
    • http://lightstart.xyz/why_do_i_have_a_bald_spot_on_the_crown_of_my_headzkzqf.pdfIn PDF document text
    • http://bupetud.xyz/gokofqcz7o.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/zaxefemebidaz/delta_math_answers_piecewise_functions.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/11789205375.pdfIn PDF document text
    • http://bepunemafozo.epizy.com/when_rabbit_howls_kindle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/533ee6da-6afd-4bd2-b7ce-c607801f3945/wewileviwofatezun.pdfIn PDF document text
    • http://mikipifovusi.epizy.com/light_novel_overlord_volume_13_bahasa_indonesia.pdfIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_53e159f6fd17406e9ec3f2450d9fc587.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/how_to_install_printer_hp_deskjet_2620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7572a9ee-a952-498a-928a-facc0d88e9b1/50636678993.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_7621d6cac98944b7b89d9f4c09b99d4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/venice_map_tourist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/511a06f4-e01b-49db-a2f4-734b7147881a/how_to_set_up_roku_3_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f327bd3-733c-4d84-b756-690880af8a94/jutedexopawak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dd27eb3-8814-4388-8d7f-d69a2ac46053/25405936005.pdfIn PDF document text
    • http://nutujetis.rf.gd/ecoturismo_no_amap.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_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 5248 bytes
SHA-256: 21dac72ad10ac577366c335f7982322adeacc3bc2243af43aba88c8177515b31
font_01_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 12172 bytes
SHA-256: 385611267f03c8973f5f7b41fd681773adcdcd4aada1861e910c10050e8e6f3e

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