Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81929b7d28fffc4…

MALICIOUS

PDF

79.5 KB Created: 2021-03-13 17:12:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 34c4388f098dcffb372b6bdf1bfb46ca SHA-1: a3ebe8e6bcda27a67d999072dc407d20d7f201be SHA-256: f81929b7d28fffc40609cf456ab7c80fb72c7b5da71c4cb04df659a4d9229a09
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a phishing and potentially malicious document by ClamAV and an ML classifier. The document body is heavily obfuscated, but the presence of external links and the overall heuristic firings suggest an attempt to redirect the user to a malicious site, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is being leveraged for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=systematic+error+vs+random+error+pdf PDF link annotation
    • http://pannochki-art.com/wezekiligaxukidoj0rswh.pdfIn PDF document text
    • http://chunyoo.com/86617102997ztyvl.pdfIn PDF document text
    • http://buliwomof.22web.org/free_wedding_invitation_templates_word_2007.pdfIn PDF document text
    • http://jisubumutowegur.22web.org/47477341755.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/bamirekonumu.pdfIn PDF document text
    • http://benosetib.iblogger.org/samsung_lithium_ion_battery_18650_datasheet.pdfIn PDF document text
    • http://kewotij.mypressonline.com/22175817147.pdfIn PDF document text
    • http://nakomajuvedina.iblogger.org/english_vocabulary_list_with_tamil_meaning.pdfIn PDF document text
    • http://myfirstsite.xyz/how_to_find_the_tension_of_a_string_in_a_pulley_systemnv4wd.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/bgp_to_ospf_redistribution_configuration_example_juniper.pdfIn PDF document text
    • http://helpcreditscore.info/12339924066kblp4.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/davawina/dreams_by_langston_hughes_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f3e756-873a-41ba-8e8e-ec4610cf36a4/30219833837.pdfIn PDF document text
    • http://zululofigitesep.epizy.com/71328484362.pdfIn PDF document text
    • http://fidikaxano.myartsonline.com/connect_4_rules.pdfIn PDF document text
    • http://sakogabutal.onlinewebshop.net/what_does_the_clock_is_ticking_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/konica_minolta_c224e_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/33190789670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8750c00d-9378-42ba-9ab2-7c54751ac814/nufatotuvipela.pdfIn PDF document text
    • http://dajomilot.atwebpages.com/aquacultura_em_mocambique.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_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 5536 bytes
SHA-256: 088b31ae88526b8f35d1f320bfc7d5591aad25594b1358f4923337e95d147c20
font_01_sfnt_off000108ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108ED 11740 bytes
SHA-256: 4d3bc709d5a16abc0068e0302e6e3a437f54dace08f2210d99ca6c166088d307

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