Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88e762698dc399d…

MALICIOUS

PDF

81.9 KB Created: 2020-12-21 06:02:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0e0932a390e2ff14d71e50f97f85254d SHA-1: 93e78809ece840c1eabb7535b55a66515cba7808 SHA-256: d88e762698dc399df41773afc69bcb35925a355237446837207aa0d3ced8b3f4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The primary purpose appears to be directing users to various websites, potentially for SEO manipulation or to serve as a distribution point for further malicious content. No scripts were extracted, but the presence of numerous external links suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://trafftec.ru/123?utm_term=heathers+sheet+music+pdf PDF link annotation
    • https://negotibuveno.weebly.com/uploads/1/3/4/7/134733978/kemidiwenaw-lusurak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451352/normal_5fc8d90ea852a.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/xasiravenejomajaxaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379971/normal_5fd09b28a48b8.pdfIn PDF document text
    • https://lijujizakivim.weebly.com/uploads/1/3/4/6/134634855/tulimixosun-rezubek-tedanutopiv.pdfIn PDF document text
    • https://talogaxuzule.weebly.com/uploads/1/3/4/5/134596774/744aba6750.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/3285464.pdfIn PDF document text
    • https://kuginipa.weebly.com/uploads/1/3/4/8/134853520/225de4e8f03ca.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/8370800.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://static1.squarespace.com/static/5fdea7f851e6b539731cab78/t/5fdf791dd85ca26442164971/1608481054023/pewax.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57982a879396864270a01/t/5fd0d3ed5c296e7a687e6588/1607521261294/makekofikoton.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcecfc5efaa704a0f58b666/t/5fd158777cf94534dc4ba89e/1607555191798/word_game_crossword_app.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00C 4992 bytes
SHA-256: a17a7f836c70ecb4299d43a0709761dd0079886a6d74cbe4734a9df9bc7b2d1f
font_01_sfnt_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 11672 bytes
SHA-256: e0de8eaf5167d177b89e3fa6d1904a706d509880e1acc37afd40a4b513691cde
font_02_sfnt_off000117a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A1 16100 bytes
SHA-256: 84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52
font_03_sfnt_off00012c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C70 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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