Malicious PDF — malware analysis report

Static analysis result for SHA-256 652c4be29bc11550…

MALICIOUS

PDF

78.7 KB Created: 2021-03-30 07:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: da826532e669fffaa8aa726d419fff70 SHA-1: 517ea7b5f07ddded27b34b6e055d623e2d2965bd SHA-256: 652c4be29bc11550df368c9423da39600a1558cd3cdff9e570c7b8225efa2e7e
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 of which are hosted on disposable domains, suggesting a link farm or SEO spamming operation. The document body, though heavily obfuscated, appears to be a lure for PDF downloads related to 'Maulana abul kalam azad books pdf download'. The ML classifier strongly indicates maliciousness, and the presence of numerous external URLs points towards an attempt to redirect users to potentially harmful content.

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://xezojetit.ru/award?keyword=maulana+abul+kalam+azad+books+pdf+download PDF link annotation
    • http://vobafoselalulor.mypressonline.com/tevukobapexetabevu.pdfIn PDF document text
    • https://nuvitofoje.weebly.com/uploads/1/3/4/6/134640236/4265620.pdfIn PDF document text
    • https://mizavujubamu.weebly.com/uploads/1/3/0/7/130775062/xomosowijef_vinigulif_vanobe_lewadojovirime.pdfIn PDF document text
    • http://naturfresh.fun/11526086735to90z.pdfIn PDF document text
    • http://orehi-siberian-force.online/links_awakening_turtle_rock_mapby0jh.pdfIn PDF document text
    • http://kasalewizu.22web.org/51289470023.pdfIn PDF document text
    • https://mijonezogiju.weebly.com/uploads/1/3/4/3/134308960/sobobifon.pdfIn PDF document text
    • http://bekopomulasebi.getenjoyment.net/62805243313.pdfIn PDF document text
    • https://tomudonaki.weebly.com/uploads/1/3/4/7/134715401/wetofedi-jixelunorusaku-barusafe-fupopixo.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/gedexim/current_assets_and_current_liabilities_list.pdfIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_a1f609c094dc4b7087b917743650e903.pdf?index=trueIn PDF document text
    • http://nizowozutagele.atwebpages.com/sumilefimafuwopimabu.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/zolanosovevoke.pdfIn PDF document text
    • http://joxumokuri.epizy.com/which_is_the_best_kreepy_krauly.pdfIn PDF document text
    • http://tebuwujovu.rf.gd/biology_11th.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_429b8cae7c404289bffc1527a88edc59.pdf?index=trueIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_a3cd970589e24bb58e04c3d20aa6cc3d.pdf?index=trueIn PDF document text
    • https://24b051fc-04af-4e2d-8b9e-4e75c06063ec.filesusr.com/ugd/1a488c_dea9bf34c25b438b88f6a580c74369ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/baldi_basics_field_trip_apk.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_361624a0c1e5489da839bc44d8aba4d2.pdf?index=trueIn PDF document text
    • http://kisezemewarajox.rf.gd/80798531615.pdfIn PDF document text
    • http://vatupizukuvos.rf.gd/hindi_tutor_grammar_and_vocabulary_workbook.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010630.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10630 21524 bytes
SHA-256: 8781d1b0be29fe64fa54980c4e31a09f483bbc2c80a49159bb09c4fd07bfe5a1
font_00_sfnt_off0000cfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB1 5440 bytes
SHA-256: ac50d73250a939a38ce262f9988d9bee7f8c426769465d7e599031e7171b1ca4
font_01_sfnt_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 10456 bytes
SHA-256: cbd54d787b1f92bcf1c48ec640ed6cf93903ba1bd75038278ee2a28390f758b4