Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dba2fa022fb7a3…

MALICIOUS

PDF

76.9 KB Created: 2021-02-14 21:38:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3c3fcc15ed33144fae0ff8c09e121d7e SHA-1: 4ac8e710f10514883f8c8a93fbb3580cef429bb3 SHA-256: a2dba2fa022fb7a32da8c6c717e2cda1ba04ab1dc6f5b7d305f414e28517af4d
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though truncated and obfuscated, contains text that suggests an urgency lure. The presence of numerous links on disposable hosting further indicates 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/aws?utm_term=brooks+guide+rails+transcend+4 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4443814/normal_5fd77c980ea87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393785/normal_600de9739c7e6.pdfIn PDF document text
    • http://steelsho3.club/stickman_run_3_unblockedwk6ng.pdfIn PDF document text
    • http://eeuuurrrrr.space/xukijozajerefevolisumnbrr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426066/normal_5fd62fef1eedd.pdfIn PDF document text
    • http://amst-watch-v2.club/70157171987t7zkz.pdfIn PDF document text
    • http://wacc-cat.org/44633633182vr4j1.pdfIn PDF document text
    • http://miiliioner.xyz/26822032368bc5hj.pdfIn PDF document text
    • http://medtechnika1.ru/biremofijibolemutudew0ov5.pdfIn PDF document text
    • http://operationhomeplate.com/break_the_prison_mod_apkpuremj7qo.pdfIn PDF document text
    • http://makamar.online/80769348184qwrdo.pdfIn PDF document text
    • http://onlineeshop24.xyz/vimiguwumufaxewoman4v2cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387224/normal_5fd8d4fc7d4c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://redikubegoda.epizy.com/witixira.pdfIn PDF document text
    • http://sonisan.epizy.com/barriers_to_effective_communication.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/70566462098.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/azhage_azhage_album_video_song_kuttywap.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/best_english_thriller_movies_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_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 5308 bytes
SHA-256: 0b8cd2087782f7d6f00d44b2e4fed12e2354c9d3afba20e7e497b021675a647b
font_01_sfnt_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 11408 bytes
SHA-256: 4b50938a7651edf4ffb02cf1805f920c6dc37035ff894a152b7b6f9fb7ed99e5

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