Malicious PDF — malware analysis report

Static analysis result for SHA-256 1621088e79a1f3ce…

MALICIOUS

PDF

80.4 KB Created: 2021-04-04 21:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d8c5c56bb0bc4abff6fa22927a49c5e0 SHA-1: 562d7d6c3ac02bb9a54b7aaba6378bae84bc7093 SHA-256: 1621088e79a1f3ce9cb7b97c31b20d50a76928bb6c165eb753511f593d78bf17
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The PDF structure and embedded content, despite being heavily obfuscated, are indicative of attempts to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/award?keyword=backward+difference+table+pdf PDF link annotation
    • https://felabare.weebly.com/uploads/1/3/0/7/130776415/xokosam-selotesejulej-pezukuxafanoba-dexal.pdfIn PDF document text
    • http://gifavojam.scienceontheweb.net/metuzekuzaxo.pdfIn PDF document text
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/153440.pdfIn PDF document text
    • http://buvalopexur.mygamesonline.org/80252572088.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/fqHibqT/81080235548.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/allegheny_national_forest_map.pdfIn PDF document text
    • http://piriveva.scienceontheweb.net/arihant_differential_calculus_free_download.pdfIn PDF document text
    • https://porokademapu.weebly.com/uploads/1/3/4/9/134901730/2629869.pdfIn PDF document text
    • http://nijalatol.mypressonline.com/cellular_stealth_camera_reviews.pdfIn PDF document text
    • http://retamos.mygamesonline.org/88703076329.pdfIn PDF document text
    • http://tafiwon.mywebcommunity.org/definicion_de_chakra.pdfIn PDF document text
    • https://punoburewi.weebly.com/uploads/1/3/4/3/134305970/317426.pdfIn PDF document text
    • http://jitufar.22web.org/49018307770.pdfIn PDF document text
    • https://cdn.sqhk.co/sozimelizak/cr57Rgf/tumadodulisifo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tinuzutajalik.epizy.com/silamewejotagijada.pdfIn PDF document text
    • http://wipezusefoxilu.rf.gd/6397556260.pdfIn PDF document text
    • http://vopebukowape.rf.gd/mowoxi.pdfIn PDF document text
    • http://zalowakudedakov.rf.gd/nizonowadeletavoriwivemu.pdfIn PDF document text
    • http://xumerapugegivo.epizy.com/big_ideas_math_algebra_1_common_core_textbook.pdfIn PDF document text
    • http://taberadajip.atwebpages.com/37360521804.pdfIn PDF document text
    • http://jedebusarotatux.epizy.com/past_tense_present_perfect_tense_bungen.pdfIn PDF document text
    • http://vezoxonu.epizy.com/kmspico_activator_for_windows_7_free.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_off0000fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 5316 bytes
SHA-256: 9dfe2f1ffbba5fef311b8e90d4d16c440055861fda5643bbe24534a7b2980284
font_01_sfnt_off00010e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 11004 bytes
SHA-256: 14094477ba4f3bd3f8535f2b5bcb53e550ae9ed6787c6d3ff82c24f9eb68b366

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