Malicious PDF — malware analysis report

Static analysis result for SHA-256 5666feafeeb1348a…

MALICIOUS

PDF

119.9 KB Created: 2021-02-19 02:44:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fffbaa5bf87d810fdcc38fff2de6d7ac SHA-1: befc37fe20211c8e345b3b3f72705366bdbb1220 SHA-256: 5666feafeeb1348a77f4da503ef97d17de572f555427a0cff74d885b75ae55a1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the external links. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=hace+cuantos+a%25C3%25B1os+esta+el+ser+humano+en+la+tierra PDF link annotation
    • http://dhl-order.info/62719893773fkn8b.pdfIn PDF document text
    • http://topcreditreport.info/37889104101ityyr.pdfIn PDF document text
    • http://padigixatobezu.22web.org/insider_reporting_obligations.pdfIn PDF document text
    • http://ogranicbio.fun/78458289955xma14.pdfIn PDF document text
    • https://fanesorugetefex.weebly.com/uploads/1/3/1/3/131383934/kewipigomoges.pdfIn PDF document text
    • https://pimapavidi.weebly.com/uploads/1/3/2/7/132740410/zidoranoned.pdfIn PDF document text
    • http://totalcreditreport.info/sql_server_disaster_recovery_plan_template3gpi8.pdfIn PDF document text
    • http://tryse.xyz/13917199729e1qfh.pdfIn PDF document text
    • https://boliminukedakos.weebly.com/uploads/1/3/4/4/134494229/fd09ca06e2571.pdfIn PDF document text
    • http://khanapoorti.com/blu_ray_3d_hollywood_movies_free0bgyr.pdfIn PDF document text
    • http://tosety.xyz/84678677141uf7vi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://betemuzisifigej.epizy.com/1130456227.pdfIn PDF document text
    • http://golujaxi.epizy.com/cd_burner_for_windows_7.pdfIn PDF document text
    • http://suzimisefodude.epizy.com/86606435909.pdfIn PDF document text
    • http://wilopomuba.epizy.com/ronativetomakasutigamilet.pdfIn PDF document text
    • http://bemefidapuwemo.rf.gd/20480178507.pdfIn PDF document text
    • http://nozuwodapa.epizy.com/64404237544.pdfIn PDF document text
    • http://resawopo.epizy.com/28697449309.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B08 4580 bytes
SHA-256: 02a28caa275282e1956d8800389b6d7c72cea474ae362d419434803760442d9e
font_01_sfnt_off00017b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B38 5212 bytes
SHA-256: 04c723c89aa282c761f2adbf214b8c5c141c9a74533a48c2408a6fc3e34f8bad
font_02_sfnt_off00018c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C79 15012 bytes
SHA-256: f47e3c45be56eee2bd47153ca2efbe162ab01a1f923f231b7224ea785e80f37d
font_03_sfnt_off0001b956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B956 16188 bytes
SHA-256: dbd025f172c922c366824e5c436e0f60965002803d652913eda56d805321d196

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