Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f804f7bea0dec40…

MALICIOUS

PDF

76.6 KB Created: 2021-03-30 02:39:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 581be20b4a3c8d5ed04e9c644e4bc079 SHA-1: 8c8a3c6dbb9349d4ac5915b3d036aa705034e9a1 SHA-256: 6f804f7bea0dec40d16241772981ba5edc624b68f7a5ab0121e533f180b20b9c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of embedded URLs and the overall structure indicate an attempt to trick users into downloading further malware, likely through a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/award?keyword=air+force+paper+pdf+download PDF link annotation
    • http://islemleriniz.org/nigiwefusupusabojuvefafvcngu.pdfIn PDF document text
    • http://alcexpress1.xyz/916823229265omg5.pdfIn PDF document text
    • http://wupulij.22web.org/54993722291.pdfIn PDF document text
    • http://submonster.xyz/waxenerixebanmva1.pdfIn PDF document text
    • http://shoop-fh.ru/fewoxexikejigidumaxazewrg8z.pdfIn PDF document text
    • http://nout-sale.site/22944574815x7us4.pdfIn PDF document text
    • https://bafiredevidif.weebly.com/uploads/1/3/1/3/131384403/6546667.pdfIn PDF document text
    • http://azules.ru/zugivekikegilelukunost0zh.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/5279024.pdfIn PDF document text
    • https://sosedegif.weebly.com/uploads/1/3/2/8/132815053/zefofemirup.pdfIn PDF document text
    • https://togimapobeno.weebly.com/uploads/1/3/4/6/134649298/durodole_davulozin.pdfIn PDF document text
    • https://tawudefategubo.weebly.com/uploads/1/3/5/9/135974656/305dd41d3.pdfIn PDF document text
    • http://klossheff.xyz/games_android_2018_apk4sid9.pdfIn PDF document text
    • https://patufefuwo.weebly.com/uploads/1/3/4/3/134312622/saboperof.pdfIn PDF document text
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/7875842.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jedirolin.rf.gd/82401865198.pdfIn PDF document text
    • http://sonituzesubilit.epizy.com/fender_mustang_ii_40-watt_1x12-inch_guitar_combo_amp.pdfIn PDF document text
    • http://bategozejaxa.rf.gd/10318732479.pdfIn PDF document text
    • http://zigejuk.epizy.com/is_attack_on_titan_season_3_dubbed_on_hulu.pdfIn PDF document text
    • http://duragizir.epizy.com/is_global_developmental_delay_curable.pdfIn PDF document text
    • http://jurolabadujo.rf.gd/genokawoko.pdfIn PDF document text
    • http://dizoxijip.rf.gd/ray_optics_class_12_ncert_book.pdfIn PDF document text
    • http://nasuxenabo.epizy.com/body_dysmorphic_disorder_questionnaire.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_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 5052 bytes
SHA-256: 113622756c51c852414a125dec98fdab240df7a6957dfc3e71180e3d03fae5b2
font_01_sfnt_off000101cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 10212 bytes
SHA-256: 1f357a6a388ced9defe15932fe69ebf917a4ddc54454a0653e2d7bbbe45af0f5

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