Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fa85c3ec160427…

MALICIOUS

PDF

40.4 KB Created: 2020-11-09 16:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2114250eb07a94fca700136577b4272e SHA-1: 72d8c6a3d42c9e47de62695e246668a879f46395 SHA-256: f3fa85c3ec160427dc23b8fc4f9c987df57f17da285927310e50b9a02a6a7fed
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting, and one prominent URL disguised as a login page for an emergency reporting system. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's part of a link farm designed to redirect users to potentially malicious sites. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://trafffe.ru/123?keyword=emergency+reporting+system+-+login PDF link annotation
    • https://tekopazaxalar.weebly.com/uploads/1/3/4/3/134348639/mulipisaziro.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rugatu-rugot.pdfIn PDF document text
    • https://lubipufubuk.weebly.com/uploads/1/3/4/5/134597980/f77e0e99ed7e4b.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/bagagox-falogewo-popovoti-firofo.pdfIn PDF document text
    • https://punotajevi.weebly.com/uploads/1/3/4/2/134266109/3606663.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/nidisetati.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/10129f9f-3964-40a5-aeb2-885efd162931/michelin_primacy_mxv4_p215_55r17_94v.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/45783285263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce6ea9b5-c161-4a36-8e56-001cceea1d81/balifebur.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/limetesazidibiwoseto.pdfIn PDF document text
    • https://s3.amazonaws.com/suzeduselu/69400392064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/436d65f3-62de-43c1-b924-ba22398f2548/89669687714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd500e9e-6b01-44eb-89c5-b6359b42cf07/gamo_shadow_1000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d7b8a03-0e65-4673-b44c-fb9f16afa76e/90075379343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cc2364f-b3b3-4783-b5c9-c5e856df05f9/83620155061.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_off00005f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2A 5132 bytes
SHA-256: ee56039f509ce8c5034d23bee518b611bf55bde971fe5762eb9d557fac90b33a
font_01_sfnt_off000070a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70A9 10612 bytes
SHA-256: 06e341c2ec149b115779bf32a6a84131bc8abadf66c4ccde10652effcf94359b

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