Malicious PDF — malware analysis report

Static analysis result for SHA-256 3660f80ee27c7672…

MALICIOUS

PDF

65.5 KB Created: 2021-03-29 02:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5d0f4eaabab50bf203bc1f868ed46106 SHA-1: caed9c1f29ae7e10afa36875addca60f2c94b3c8 SHA-256: 3660f80ee27c7672c601bdd0e3aa7694b1e5d153c6615ddd0d9f161e895de2d0
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious PDF.

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://nipisod.ru/strik?utm_term=cen+tech+infrared+thermometer PDF link annotation
    • http://girlsbeach.space/48274418745k53dd.pdfIn PDF document text
    • http://oneitshop.pro/elements_of_music_eomagl8p.pdfIn PDF document text
    • http://4gusevshop.website/loxulodinixkah7.pdfIn PDF document text
    • https://cdn.sqhk.co/mufipofunup/0pjc1hi/amazon_prime_music_unlimited_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/sirazisiluz/gibiawu/hearts_on_fire_rings_for_sale.pdfIn PDF document text
    • http://ins.expert/wobujilleejw.pdfIn PDF document text
    • https://tebizojejifijof.weebly.com/uploads/1/3/4/5/134589629/2d3a98.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/jaqhbn9/bunny_runny_nose_and_eyes_in_cats.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/jhhQXgd/boarding_school_juliet.pdfIn PDF document text
    • https://pimipile.weebly.com/uploads/1/3/4/8/134883166/7304795.pdfIn PDF document text
    • https://rosiruwolokixa.weebly.com/uploads/1/3/4/7/134765588/kanoraruvo-pewidusi-fedokiwo-wugulavano.pdfIn PDF document text
    • http://zapazereti.22web.org/wewefajuzefuvedaro.pdfIn PDF document text
    • http://lg-supportteam.com/pekatixibuwapi0hkil.pdfIn PDF document text
    • https://mevuponepom.weebly.com/uploads/1/3/4/8/134899748/funetosuk-vogawuz-gamopasugo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pazutoxun.epizy.com/live_streaming_calcio_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/perafafabegaxazabux.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/how_to_make_a_maya_pyramid.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/16826134795.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/55706503904.pdfIn PDF document text
    • http://jaledab.epizy.com/beverage_production.pdfIn PDF document text
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_e12a37a3edd6497bb34c9041deea93b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/13717613468.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_off0000c383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC383 4956 bytes
SHA-256: 8a404788a44667d4caa5b3f384e4c357a32ef698473da2683a0a35c1f8102dc3
font_01_sfnt_off0000d434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 10756 bytes
SHA-256: 9296c011e0c56ff1598b04c6f93548afa8c5d942011a452aa40ef8c6f33be767

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