Malicious PDF — malware analysis report

Static analysis result for SHA-256 191541e6fe5dbc77…

MALICIOUS

PDF

79.3 KB Created: 2021-03-27 09:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 256350f905eb592a7e5461a7c8ddcc1d SHA-1: 217c980c896a08da657692263baa6e8af083d43c SHA-256: 191541e6fe5dbc7711a156a8367a1a82537321c3d70bccc668d04c743ca08334
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains or redirectors, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the heuristic findings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=net+framework+3.+51++windows+xp PDF link annotation
    • https://nedijevir.weebly.com/uploads/1/3/1/4/131406348/gelirirolup.pdfIn PDF document text
    • https://kisumeselebo.weebly.com/uploads/1/3/6/0/136021012/putadetizomebeboba.pdfIn PDF document text
    • https://tokarakuwo.weebly.com/uploads/1/3/0/9/130969339/jozenegujeb.pdfIn PDF document text
    • https://komanogorolelew.weebly.com/uploads/1/3/1/3/131380356/6606300f5ce7f.pdfIn PDF document text
    • https://pilopagitek.weebly.com/uploads/1/3/4/8/134856928/suwadamesopi-jabuwedadu-sozepuzamaviv.pdfIn PDF document text
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/801531.pdfIn PDF document text
    • http://www.opentle.orgIn 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/2d501b33-4d8d-4e26-905c-2f2863abb6ad/summer_escapes_filter_pump_instructions.pdfIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_7ef50da556334e3fa1a52d3e58f19325.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_e6b464deb94a4da289ac814755570ce5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18bd2bba-d6a5-4106-9562-485f12acaba8/la_crosse_radio_controlled_clock_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c1c6ed1-8cf8-447d-9d29-4a8bb47f73c6/how_to_use_carpet_and_upholstery_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9043af40-d19f-47a4-9653-924b44915318/27433683240.pdfIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_a338ce80f0664801997f978d0d9524e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae6ea7d5-219b-4baa-8b52-3ada090e90fe/64860394992.pdfIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_8e9dc4ea90954c45aa4063ee528c70da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2def4be-ec4f-47f5-8d72-ca5c55d3b6fc/gipelolajufure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d69e91-1c4a-494c-b3cb-786b083ca0d0/bobut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c51cc794-38e9-44e3-ad53-751bca8441df/74804756292.pdfIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_ab4f022e734a41e280d3c92defc11f3d.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e880.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE880 11076 bytes
SHA-256: c2512c935b63865b77329318fc025261d221790ded36e8f21cef68bcc8a8af1d
font_00_sfnt_off0000d4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F0 5720 bytes
SHA-256: fb3da9ebe0b6c28bf0be7aec50a26f1c514c9542e275b3f10a8eb8982e550088
font_02_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 10928 bytes
SHA-256: 72b0f6a1fada551c257f8ae3a10bf48f241eed4357f9bd8422cec09b7e63c1e7

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