Malicious PDF — malware analysis report

Static analysis result for SHA-256 879f318591a616af…

MALICIOUS

PDF

79.6 KB Created: 2021-03-16 07:38:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: d7262822d1abd8d5f367a7475d6c4978 SHA-1: 984f3b2c2f7c463bc9b7b7de2cbee1ea9451697a SHA-256: 879f318591a616affdc51235de71efa53fbc72a05d0780eab5173ba8ebc2e2c5
66 Risk Score

Malware Insights

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

This PDF document was flagged by an ML classifier as malicious. It contains a large number of embedded URLs, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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://xezojetit.ru/wix?keyword=uniform+circular+motion+lab+answers PDF link annotation
    • https://nufapapezo.weebly.com/uploads/1/3/0/9/130969462/5945332.pdfIn PDF document text
    • https://jewefero.weebly.com/uploads/1/3/1/3/131383264/a17b97a1.pdfIn PDF document text
    • http://3-bureaureport.info/lekasegevifemefusijaxc0i5q.pdfIn PDF document text
    • http://minosijasif.mypressonline.com/original_grey_sheet_food_plan.pdfIn PDF document text
    • http://nasporte1.fun/cashflow_101_e-_game_freetz7fk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489846/normal_600d413414049.pdfIn PDF document text
    • https://lixazasowab.weebly.com/uploads/1/3/4/5/134588429/5399839.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391331/normal_5fcd841e6df37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498366/normal_5fcee1b21b2bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5fd6731178e14.pdfIn PDF document text
    • http://wow50.pro/15005535004m5ig5.pdfIn PDF document text
    • https://zutomivopisi.weebly.com/uploads/1/3/6/0/136051870/570705b95c.pdfIn PDF document text
    • https://wuwawumakilur.weebly.com/uploads/1/3/4/8/134875279/71f6b6139cf7594.pdfIn PDF document text
    • http://goproits.com/serial_de_instalacion_windows_8.1_32_bitst2sro.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/43260270382.pdfIn PDF document text
    • http://chisto-chisto52.ru/the_merchant_of_venice_sparknotes_act_3bqi3w.pdfIn PDF document text
    • http://vetebozo.mypressonline.com/medesipuka.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/what_are_the_levels_of_jiu_jitsu.pdfIn PDF document text
    • http://goldstein.berlin/pexifupigolilumufawopivonk62ia.pdfIn PDF document text
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/6772468.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 5248 bytes
SHA-256: 2a0d0c0e5931139c6d1759099ea93b0bbc3050e596d9eb99c8b1471e385a7e46
font_01_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 10920 bytes
SHA-256: 28551d6f6a7ce62ca289c1c3e4750e655335e1343d6d266a38a4311823e3093b

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