Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf76fc10f457b314…

MALICIOUS

PDF

79.0 KB Created: 2021-04-18 06:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f0b277e334899aa89a397257a21a832f SHA-1: 7256e18cafc383e6af7562b7ddbdc8eb6d8a1e34 SHA-256: cf76fc10f457b314e6c53914907125fa76dc78806a53c57becf87f78519edeb1
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the 'PDF_SEO_LINK_FARM' heuristic confirms a large number of external links. While no scripts were directly extracted, the presence of many external URLs suggests an attempt to drive traffic or deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/strik?utm_term=graco+duet+sway+weight+limit PDF link annotation
    • http://help-lnstagramcopyrights-verify.com/60355010684rz6x0.pdfIn PDF document text
    • http://zesamoa.online/miruzegavanibibabadodkoci1.pdfIn PDF document text
    • http://stakingyfi.com/fasaruderukisidaliresa203av.pdfIn PDF document text
    • http://leadtop.co/3452376693mc6i1.pdfIn PDF document text
    • https://cdn.sqhk.co/wavefekus/ihzpD8l/sapofajedixizunakimusopa.pdfIn PDF document text
    • https://cdn.sqhk.co/wokinuge/jhhALjb/gunukegokexekugorix.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/5gciaN5/5399605697.pdfIn PDF document text
    • https://cdn.sqhk.co/savekedeg/jhahggf/42978871353.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/agcgjTe/fibevaborimidobufalazuxir.pdfIn PDF document text
    • http://familyit.info/frontline_commando_2_mod_apkpureu4e4u.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuzopat/7jghaCR/fovasuvimunexasoteveri.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/qifhcgi/pulafopib.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/vibuvomomuv/nimewotegepomizokez.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/8823188252.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/amniotic_fluid_function.pdfIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_bee895699f294614be7561afda9c721f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suzujewa/96668186649.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/tuxijiwawevikisis.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/14635554371.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_649e19e7a4c7421b8caef70a19db4e0d.pdf?index=trueIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_05ed38304d6c4609a8aba2a415dc9e7e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lukepepe/define_information_asymmetry.pdfIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_44ece57f07084216b63ad1e1d729ab72.pdf?index=trueIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_1488bf7d5f47403db1ffebefd0f46ef9.pdf?index=trueIn 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_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 5576 bytes
SHA-256: a658936bb2ccf5cd4618e5734a02dca84b2dad07f20e404068da5f57e565152f
font_01_sfnt_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 10472 bytes
SHA-256: f1c7d52800ac8a45d44133ebe3ce42486b09d099c0ba4daa1a333c2108c43791

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