Malicious PDF — malware analysis report

Static analysis result for SHA-256 736d1b4fb8913358…

MALICIOUS

PDF

74.6 KB Created: 2021-03-31 04:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0ab73082231ded9cbca3c2df07f44dff SHA-1: 93e8c3b26500a4ed526973d1c3bf8f917eb1e314 SHA-256: 736d1b4fb89133589b8aa2eb36132cf972b0f2f93adabd5899ef12fd9f1c68d2
66 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs as link farms on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://gimoguvi.ru/award?keyword=free+online+auto+repair+manuals+pdf PDF link annotation
    • http://praktika-ingenieur.com/how_to_manage_time_in_lockdownj57zq.pdfIn PDF document text
    • https://cdn.sqhk.co/wovenebi/ujhhjtc/81745300013.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/7jf7Pij/jawile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_6037f5dc30c12.pdfIn PDF document text
    • https://cdn.sqhk.co/liripudeb/qiagchi/62865452836.pdfIn PDF document text
    • https://cdn.sqhk.co/mojazejo/ifjjhg9/80442707532.pdfIn PDF document text
    • http://nufurimuler.iblogger.org/speak_softly_love_tab.pdfIn PDF document text
    • http://shop50off.info/ketuzosazaxopowomolusapowm0gb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_60490905579ec.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuravaxoxi/WQ3bhgI/digi-_key_catalog_2011_section-_b.pdfIn PDF document text
    • http://goods-amzon.com/rixosuzilupitegixonebatbvt.pdfIn PDF document text
    • http://storeyou.store/korurivipomiayq34.pdfIn PDF document text
    • http://kittyplay.online/naruto_shippuden_ultimate_ninja_storm_androidfmbw5.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/Ajigghd/rigeran.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/WVetTLc/38287499969.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/ihjc3ie/74632200854.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/dxeheia/butajixad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417321/normal_5fd284da12731.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kanufes.rf.gd/muvoximanoko.pdfIn PDF document text
    • http://tikawemukotuwaw.rf.gd/xewoxidalekubovam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fec6878-a50e-4aa3-9c48-3681526f6f05/c480fw_transfer_belt_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5971b05e-1bae-4ed0-b29a-f7309ae00613/semor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/638689ce-9f7f-44f9-bfe2-23d036352ed6/what_is_the_purpose_of_anode_rod_in_water_heater.pdfIn PDF document text
    • http://bizozominam.epizy.com/10427884744.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 5144 bytes
SHA-256: 8ed3d811e2b89fd2ce0c485ab4314b9955a87d8c9ef42631158ce0ae5b069b91
font_01_sfnt_off0000f867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 10544 bytes
SHA-256: d37457eafcf7c5c0fcdc06b030fcaceab6075e5182ea0a3de0d35baccb7392f4

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