Malicious PDF — malware analysis report

Static analysis result for SHA-256 750bff03efc21301…

MALICIOUS

PDF

136.7 KB Created: 2021-03-21 11:22:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0e296a6248816fb723f4d8255fff0187 SHA-1: 7d83d7c42e4ca643c11ba2f836be48b84320b863 SHA-256: 750bff03efc213014a04da410928029fee8c158c569e047d5df3a6e3b7e905f1
96 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 are disguised as manuals or technical documents, indicating a link farm or SEO spam campaign. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/wix?keyword=allen+bradley+powerflex+40+manuale+italiano PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369311/normal_60152e77504aa.pdfIn PDF document text
    • https://bedasalisavif.weebly.com/uploads/1/3/4/6/134601990/lewolag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527345/normal_5fc7c5591c0c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426953/normal_5fce89650c220.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370052/normal_60095ddc1ca65.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/ehfNijt/microsoft_defender_2020_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501046/normal_604d42432f1fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402244/normal_5ff206fe25f61.pdfIn PDF document text
    • http://lepegumokolato.iblogger.org/24686617480.pdfIn PDF document text
    • https://selegisazo.weebly.com/uploads/1/3/5/3/135323244/3fb944c6.pdfIn PDF document text
    • https://woperuxotuxolo.weebly.com/uploads/1/3/4/8/134849923/buxibukomazitot.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/iLTYjdl/30691487501.pdfIn PDF document text
    • http://bavewemelemare.iblogger.org/pijuki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415527/normal_60016eaa64bde.pdfIn PDF document text
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/d4ba240356f39.pdfIn PDF document text
    • https://cdn.sqhk.co/kowumutajaw/hehhwih/pepodaxad.pdfIn PDF document text
    • http://kuzunutonaw.22web.org/8455176911.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/echbif2/81853445562.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mepumazat.epizy.com/sedidefuminabefuleten.pdfIn PDF document text
    • http://betiger.epizy.com/kimmel_accounting_solutions_manual.pdfIn PDF document text
    • http://puzasapexuwuju.epizy.com/31725385194.pdfIn PDF document text
    • http://sufumawug.epizy.com/superman_vs_batman_game_mod_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCE4 5628 bytes
SHA-256: 40d65aaf4fa7146586d3014bc81c8bb29c5fdbaf4be2928af0e6398f62687ddb
font_01_sfnt_off0001d018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D018 12628 bytes
SHA-256: d6266595e20519f4eaabbf239a14d6130f02582cbb6bce3f312d4da2ad09594b
font_02_sfnt_off0001fb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB4F 18048 bytes
SHA-256: 8004a8b18802c05327eef2f2f5ecf707485000bf520d52e44851e10d5d56d876

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