Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4923f1d3cceee68…

MALICIOUS

PDF

62.8 KB Created: 2021-02-14 20:57:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7601fca569b353f97945c219c7e9dd49 SHA-1: 0b9e0f79ebe0b6a16a12cd80aa694fcc55590017 SHA-256: e4923f1d3cceee68646c033c7214910798c0ac3ce0066e4328b074dc59a7c8be
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://seumenha.ru/wix?keyword=descargar+libro+evangelismo+personal+myer+pearlman+pdf', is presented in a way that mimics search results, likely to trick users into visiting a malicious site. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/wix?keyword=descargar+libro+evangelismo+personal+myer+pearlman+pdf PDF link annotation
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/67fa284a486e9a.pdfIn PDF document text
    • https://dexejajakoto.weebly.com/uploads/1/3/0/7/130739268/9a062e970954aa.pdfIn PDF document text
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/siposub_vumixux_farevosenug_jenatuf.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/xakumuturitinuj.pdfIn PDF document text
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/e5e10b.pdfIn PDF document text
    • https://japapetokanov.weebly.com/uploads/1/3/1/4/131454126/9a4dcc.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/sijuma.pdfIn PDF document text
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/9211533.pdfIn PDF document text
    • https://jajugodi.weebly.com/uploads/1/3/4/9/134902248/jojutiwafezodi.pdfIn PDF document text
    • https://penopamez.weebly.com/uploads/1/3/4/4/134496097/kepugirebipe.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/CiinhdR/donkey_kong_jr_mini_arcade_machine.pdfIn PDF document text
    • https://funujitumim.weebly.com/uploads/1/3/5/3/135347265/72685037.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/rilexazejuzovep/connect_android_auto_to_honda_crv.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/51338100812.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/birthday_card_design_images.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/5056281308.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/taimienphi_vn_fixattrb_bkav_8370.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/fractions_worksheets_math_drills.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/98652645965.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_off0000b931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB931 5776 bytes
SHA-256: 5e3c7f9b6d34772a88f4c83de196ac7a40108fb713cd81f9f57969e0074700de
font_01_sfnt_off0000ccda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDA 9616 bytes
SHA-256: bd9747a9ed4f13ef883c34f5e1ec968b918d4bd1a2b8c3ba93e6c46db5bd4768

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