Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d8d19b4660cbdd…

MALICIOUS

PDF

86.6 KB Created: 2021-02-09 17:32:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b7d1d4b96114beb50f908680bbda205b SHA-1: 58d67c25770d78186abdaf6a91c33aeb2ccdacd1 SHA-256: 73d8d19b4660cbddc347b4adbcd6648bfd4912d25fc0463658f9fc0e2de13413
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards an attempt to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/aws?utm_term=models+of+health+psychology+pdf PDF link annotation
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/lukimuzir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408174/normal_5ffaa8c52f74a.pdfIn PDF document text
    • https://zufavaxevonek.weebly.com/uploads/1/3/0/9/130969036/568415.pdfIn PDF document text
    • http://bawoputameded.iblogger.org/embed_power_bi_report_in_sharepoint_2013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496204/normal_6018ad53c8381.pdfIn PDF document text
    • https://zewemoledomuro.weebly.com/uploads/1/3/4/7/134746436/33c6fda66c.pdfIn PDF document text
    • http://pepirizibizedel.22web.org/emitir_carto_cnpj_em.pdfIn PDF document text
    • https://tebifuwufarul.weebly.com/uploads/1/3/4/8/134886387/vapiw_zozovotil_womemejuwari_lixajeg.pdfIn PDF document text
    • http://fenofaxizuva.22web.org/62689224920.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465010/normal_5fc7a005beea8.pdfIn PDF document text
    • https://dujibirarikow.weebly.com/uploads/1/3/4/3/134321406/d6cc11f.pdfIn PDF document text
    • https://lefoteliwe.weebly.com/uploads/1/3/4/0/134095852/wevetugifapitukik.pdfIn PDF document text
    • https://jexujomasok.weebly.com/uploads/1/3/5/3/135343442/218405ce.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
    • http://peronilekovo.rf.gd/android_sdk_manager_linux_command_line.pdfIn PDF document text
    • http://merapuw.epizy.com/kopunabip.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/40237871028.pdfIn PDF document text
    • http://dojiseb.epizy.com/celine_dion_titanic_video.pdfIn PDF document text
    • http://notufexunu.rf.gd/sobodasawu.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/camosun_library_apa_guide.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_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 5064 bytes
SHA-256: c0bab6d54efb065fca85dc487af5091b440afe59a9eebf36dbc6811fecf58120
font_01_sfnt_off000105d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 10584 bytes
SHA-256: 0cba03e3f7b7259acee78e46128b6362950b5338cc0417b1a1dde59d5e9653d3
font_02_sfnt_off000129cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 16068 bytes
SHA-256: 4111154e076100b82c15878e86323e11c180b5a01e43f9a7d572491bd9fbd500
font_03_sfnt_off00013e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E68 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

Open this report in the interactive analyzer, or submit your own file for analysis.