Malicious PDF — malware analysis report

Static analysis result for SHA-256 29aa63304f119b6a…

MALICIOUS

PDF

79.1 KB Created: 2021-03-17 22:47:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65c009aea496544a50b71c7971a5a02f SHA-1: 11b51f889d544bc159760efeaf6739c6ec114869 SHA-256: 29aa63304f119b6ac455f8f1b55c0f1671fea1c03dad2ffd073f5499e186e260
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to algorithmically generated URLs on disposable hosting and a high ML score. The document body, though heavily obfuscated, suggests a lure related to a 'lab report'. The presence of external URIs points towards a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://fokemale.ru/123?utm_term=hydraulic+conductivity+lab+report
    • https://cdn-cms.f-static.net/uploads/4486763/normal_6038652770f13.pdf
    • http://miwuzobi.sportsontheweb.net/nafta_certificate_of_origin_fillable.pdf
    • http://tameenegypt.com/disikikorusawaxosebawemyep9.pdf
    • http://canonsburglake.org/80913545997e4t8o.pdf
    • https://static.s123-cdn-static.com/uploads/4474736/normal_5fdfae7647397.pdf
    • https://cdn-cms.f-static.net/uploads/4460706/normal_603b94e33c8f0.pdf
    • http://mesutilixuta.sportsontheweb.net/xamizafafev.pdf
    • http://tdsevsvet.ru/binapejufuxamukigufujaluwylgde.pdf
    • http://hellochildren.online/jozelufnjux.pdf
    • http://gatorama.space/denudipivovowepebagisajobqubmh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fb15da4a-bf76-4db1-8620-a7d08d28a988/how_to_bind_traxxas_tq_receiver.pdf
    • https://uploads.strikinglycdn.com/files/9448008f-9be5-4e8f-87de-b43c6a346207/lakokonalokare.pdf
    • http://paguxesij.myartsonline.com/57482156644.pdf
    • http://sufelubunat.epizy.com/campbell_hausfeld_26_gallon_air_compressor_manual.pdf
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_2f4e8aa249e244cfb307129bfd9b1a67.pdf?index=true
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_ad94e229f6254d3f848cba3881aa0e2e.pdf?index=true
    • http://najekaweza.onlinewebshop.net/kenunumadefakufide.pdf
    • https://uploads.strikinglycdn.com/files/5fe96c1d-ea79-4640-ade9-677d4287085f/88163264765.pdf
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_e4cd1f8068984ad0ab2018f089d30dd1.pdf?index=true
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_c75df7561d80478985da37004d571ede.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7a4ca5f3-0dae-49fa-8020-f2c7e3c42aa3/kejub.pdf
    • http://gifidabula.atwebpages.com/arabic_bangla_dictionary.pdf
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_5c751814f4184906bae7a21ef1bb71f1.pdf?index=true
    • http://futotodogedujox.epizy.com/zexakemesudamigebodasem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e031.bin
ee3a3c4a8c8f10b5b7817d8fd991b979633d75fd24585b7ac2cbbc922c5c7339
pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 5152 bytes
font_01_sfnt_off0000f1c9.bin
0d656e185c8f3de0ca0abbd8fea8699b748cbd5914256ee0c9a88f39ccc0337b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 11484 bytes
font_02_sfnt_off000118ac.bin
670be7b90497138287a6bd01c46805766b61ed5802602ace0a011236ebf6ef98
pdf-font-stream PDF embedded font (sfnt) at offset 0x118AC 16316 bytes