Malicious PDF — malware analysis report

Static analysis result for SHA-256 d543ccb1b8916cfc…

MALICIOUS

PDF

74.6 KB Created: 2021-04-08 06:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c81978b2a10d33fa3bb4c3393255c47 SHA-1: be1284992d16f9fdaa0fea830010560fb62aefd9 SHA-256: d543ccb1b8916cfc60c7e6f7d9bd8a8bd9ce534ecaa1ddc96a6d9477df93b195
136 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating suspicious links and ML classification flagging it as malicious. Specifically, it uses invisible links to direct users to domains like 'loginwithfb.site', a common tactic for phishing or malware delivery. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://leonvi.ru/wix?keyword=dirk+the+protector+quizlet
    • https://cdn.sqhk.co/zalogifewoje/dVOkYif/kejine.pdf
    • http://freshka.fun/wd_tv_live_plus_hd59b60.pdf
    • https://cdn-cms.f-static.net/uploads/4493201/normal_603f9f0be622f.pdf
    • https://static.s123-cdn-static.com/uploads/4451766/normal_5ff10af84bf0b.pdf
    • https://static.s123-cdn-static.com/uploads/4450870/normal_5fdea8499e49d.pdf
    • http://emirofficialzm.com/85121297250ezcul.pdf
    • http://wersita.fun/61908470753f5bbn.pdf
    • http://itchia.space/jewukewumezopiwezipotexex76ex.pdf
    • https://cdn.sqhk.co/vomuvojovi/gajiKjb/rusunefuzuvarinuvid.pdf
    • http://usacreditscore.info/27881470715h1xrh.pdf
    • http://capridigi.com/43303683112nb54e.pdf
    • http://delayikapy.xyz/aosp_android_9._0_pie_s6_edge3q506.pdf
    • http://nashremont.site/wugezifunilrzt4.pdf
    • https://cdn.sqhk.co/fesakesovoka/cb1SFLM/ball_blast_cool_math_games.pdf
    • https://cdn-cms.f-static.net/uploads/4500910/normal_605853c9bd66e.pdf
    • https://cdn.sqhk.co/lojosexotak/KWXiejg/rupaximutiturureg.pdf
    • https://cdn.sqhk.co/madagijoj/EaxjhPp/31182586251.pdf
    • http://loginwithfb.site/how_to_plant_sweet_potatoes_indoorso80k1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sedowedi/doripumovubonutirisujiki.pdf
    • https://s3.amazonaws.com/mesotodimus/46754355076.pdf
    • https://s3.amazonaws.com/tapexiw/watermark_powerpoint.pdf
    • https://s3.amazonaws.com/tuletivotarupu/zefumukorizitufo.pdf
    • https://s3.amazonaws.com/wuwabobujasivor/vizakire.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e60a.bin
dc94c98149e269afc5807f3155e1b99efff00290ed1d5774b213b1cf07cf1b2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 4872 bytes
font_01_sfnt_off0000f6ad.bin
3890a312d8ce4ffdf4293e2f822758804999caae9774c2c3ed4da362ca93dd52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 10876 bytes

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