Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac0bbc9751d549c…

MALICIOUS

PDF

76.7 KB Created: 2021-02-14 21:07:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9a8a5a318a87337870f4a0ee56cdc32b SHA-1: bcb250b1c06fa4ba19bf14d42f32879afe8e3a15 SHA-256: fac0bbc9751d549c1d81d7ebf9194c3f95612e8edb075374a834639245701f2f
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the presence of a link farm on disposable hosting. The document body, though heavily obfuscated, contains metadata suggesting it is a 'manual' which is likely a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=ge+326b1230p001+double+oven+manual PDF link annotation
    • http://rorezorejadij.iblogger.org/doomsday_heist_hack_guide.pdfIn PDF document text
    • http://raffle.website/905803590894swgg.pdfIn PDF document text
    • http://raifaisentapp.online/lsbf_acca_f2_notes_free27cxs.pdfIn PDF document text
    • https://zixozuji.weebly.com/uploads/1/3/1/4/131454221/pajan.pdfIn PDF document text
    • http://setofexperience.site/crank_handle_resident_evil_25ct6l.pdfIn PDF document text
    • http://bigops.fun/inside_out_understanding_emotions_worksheet03av0.pdfIn PDF document text
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/miwukawuxekizum_gitimasa_nuvimesopafal_mosab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386089/normal_60141ed67e05a.pdfIn PDF document text
    • http://tortomsk.ru/jotojeredugelpb3nw.pdfIn PDF document text
    • http://presente-top.store/24118594810cb98h.pdfIn PDF document text
    • http://lidzadva.xyz/muxipujubutejefovorapiv4u37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450631/normal_601d6ce9357d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444864/normal_6021fed32505d.pdfIn PDF document text
    • http://tulotipokumubo.iblogger.org/kogozejovekowevet.pdfIn PDF document text
    • http://erogan-encolumbia.site/ap_chem_free_energy_pogil_answer_keysm1p9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gegagino.epizy.com/mexokuragasus.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/vofomigupidozeje.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/82610038426.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/20885874368.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_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 5708 bytes
SHA-256: e1a2c5e5e5048c13b1ac97fb7b5b1ea50cd2562ea3b0a4ccd31c6587f570921a
font_01_sfnt_off00010180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10180 10592 bytes
SHA-256: 647b87adc289d0cd7eea450f7e8b93ac6182807906c19184e4e3428caf2dbc49

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