Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25fde93c4a1a45a…

MALICIOUS

PDF

94.4 KB Created: 2021-05-19 15:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 71c270cfd63107f1c7f5fd10fc560d63 SHA-1: 7273ce741c6f53521658818c04c7cfe2ef011577 SHA-256: a25fde93c4a1a45ad8ec5abef8d27d583617ff5609719a172c4cc2ecd563537a
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 4

  • 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://maypoin.ru/strik?utm_term=reading+plus+level+k+answers+change+maker PDF link annotation
    • https://muxavitegujun.weebly.com/uploads/1/3/1/6/131637584/153275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_6041a4f4c429e.pdfIn PDF document text
    • https://wopuvonu.weebly.com/uploads/1/3/1/3/131384791/xuwoki.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/sarudotimuk-rudawon-sulevetakozejam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451566/normal_600e59984a3d5.pdfIn PDF document text
    • https://nudadisaxoge.weebly.com/uploads/1/3/4/0/134018155/muloxowukiba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426822/normal_60175007892e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lixasifasi/danuzegologatukuvotuvix.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/74139198812.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/35851077414.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/62988139632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8630c11e-17c7-4837-a560-b98f04f9155c/how_do_you_unlock_an_ipod_if_you_forgot_the_password.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/xadiribufodozekul.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/serious_illness_conversation_guide_ariadne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c510172d-b5a1-4fdc-b9ca-bbb333b33b9a/13168947253.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/75513157816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b30ffa6-ee18-4247-8afb-6b9768864c3c/dark_souls_2_4k_mod.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12132 5404 bytes
SHA-256: c41b5e4f39abba544b21788c7b7b50fc2863c925e48c5560cfd5e4c70734d16b
font_01_sfnt_off0001336a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336A 12724 bytes
SHA-256: 95199322873c8448240b2cca9bde81f78f7dc48cbdcbd27d3ef0a90de938ac79
font_02_sfnt_off00015e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E23 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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