Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5842a6f250ee0c…

MALICIOUS

PDF

70.9 KB Created: 2021-03-15 01:25:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 451d97249762700a34dd940e2169e227 SHA-1: 4c05d13dd771c75345872b7b093cab5b5bd864fb SHA-256: 4f5842a6f250ee0c7657311fc1b67a2b25701047c1e300fb90ff2e2f4e95fef0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs point to suspicious domains, and the document body, though heavily obfuscated, appears to be a lure for a technical book search.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/wix?keyword=computer+systems+a+programmer%2527s+perspective+3rd+pdf+github PDF link annotation
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/negovuf.pdfIn PDF document text
    • http://eurostore.info/95033160997cy7i8.pdfIn PDF document text
    • https://zedusolurifi.weebly.com/uploads/1/3/3/9/133999882/kukotijafawu_gemenimividike_bipedofodenez_vuzisabazomi.pdfIn PDF document text
    • http://lesantyqas.online/lobavetu0zk28.pdfIn PDF document text
    • http://chambrehq.xyz/wupojirifujalupogumtbfu.pdfIn PDF document text
    • https://dirukarizudabi.weebly.com/uploads/1/3/2/3/132303081/wekosedav.pdfIn PDF document text
    • http://1xbet-registr.site/311398142428rppj.pdfIn PDF document text
    • https://bekajujoxofutit.weebly.com/uploads/1/3/1/4/131406668/nogonutimazisureti.pdfIn PDF document text
    • http://mosdendy.store/oracle_sql_remove_first_two_characters4xxyh.pdfIn PDF document text
    • https://pezevibasa.weebly.com/uploads/1/3/5/3/135306661/visabuvowizadek.pdfIn PDF document text
    • http://xbet1.fun/196063501381gaxt.pdfIn PDF document text
    • https://govabegos.weebly.com/uploads/1/3/4/0/134018252/cbe755d4ead.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/058c8ca.pdfIn PDF document text
    • https://japejezapunat.weebly.com/uploads/1/3/3/9/133999519/164f8d2f2.pdfIn PDF document text
    • http://cosmosqrab.online/is_simplicity_a_good_zero_turn_mower_for_2_acres24lyw.pdfIn PDF document text
    • https://lonufiwinejuf.weebly.com/uploads/1/3/0/7/130776555/2629597.pdfIn PDF document text
    • http://steblin.pro/beet_sugar_nutrition_informationagrps.pdfIn PDF document text
    • http://fb-pageunderreview.com/64285094522ivgpf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_bce20887c0a74f13bc9ab1a4f7d3b5f1.pdf?index=trueIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_10390f3e3e584e9987795b484f7da6af.pdf?index=trueIn PDF document text
    • https://4228e3e8-6e56-436b-9c2a-5710a6c3a216.filesusr.com/ugd/e32dc8_772cda8f10bf4bf7af9e0834cd3e33ae.pdf?index=trueIn PDF document text
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_eaf32bc72d194388b52c37e0a7609b79.pdf?index=trueIn PDF document text
    • https://814bd5e1-0b6f-40f8-b2e9-6ab0015c5eef.filesusr.com/ugd/cc77ff_a5736fae756d44efa475c0adee207b2e.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_dff870c94e364d699107d1f0edd0c0b6.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_off0000d5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 5944 bytes
SHA-256: 75cb54a229031eb119c7b6dcc26389af545438a0bf0793774426b25740ba1c6a
font_01_sfnt_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 10504 bytes
SHA-256: 111a2c843aea4ee7b0c6b0c6057a0a8a18b74d41a6062bc76001753339a8d243