Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a23bd2457cddb6…

MALICIOUS

PDF

80.9 KB Created: 2021-02-27 09:24:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b41758e85a6c082342e2efd582e2680e SHA-1: 1d2616092dc9820bbdf9b1cfb4cd2d4eebff879e SHA-256: a2a23bd2457cddb6cc3a3050401d372d1b482f9a1729ef6b1c033841869e74ac
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, including one pointing to 'pelibifir.ru', which is likely used to redirect users to a phishing or malware distribution site. The document body, though partially corrupted, suggests a lure related to financial account classification, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wb?keyword=clasificaci%C3%B3n%20de%20las%20cuentas%20de%20activo%20pasivo%20y%20patrimonio PDF link annotation
    • https://neverazu.weebly.com/uploads/1/3/4/9/134901342/puravavexumoz_sovopugugasiw_zekikapuzurumo_bopalik.pdfIn PDF document text
    • https://wenezobu.weebly.com/uploads/1/3/4/6/134625155/1f3c30adc.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/how_to_reset_waste_ink_pad_counter_epson_l380.pdfIn PDF document text
    • http://mirror-x.org/19706096168dbl6a.pdfIn PDF document text
    • https://sinuxogutit.weebly.com/uploads/1/3/4/5/134505158/6489442.pdfIn PDF document text
    • http://introdom.ru/grasslin_timer_programming_instructionslwc2i.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/75667345215.pdfIn PDF document text
    • http://hesap-al-sat.com/goldfish_collection_mod_apk_downloaddujoo.pdfIn PDF document text
    • http://kefets.xyz/71989815746ovh8t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pudolajuji.atwebpages.com/37578173577.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/zowefemod.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/how_long_is_navy_sere_training.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/junit_html_report_jenkins.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/24361678629.pdfIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/dojivigaxonuto.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 5504 bytes
SHA-256: 25f5ff96748a1ce18b7ebdbd500e71549391b599019ca0ee6b1b5064c88198cd
font_01_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 12140 bytes
SHA-256: dcce523b7c34f646e3dc39624d2a7db20197cce594f16e177c3ed1f4aa7fadd5
font_02_sfnt_off00012582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12582 4324 bytes
SHA-256: 781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60

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