Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3e7f42f96f6b10…

MALICIOUS

PDF

81.7 KB Created: 2021-04-21 10:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91a2e508ca219950bae7cdeca337233a SHA-1: 58ab61cf3fb5c515c2365b2ed097cbecc249c182 SHA-256: 3a3e7f42f96f6b10477908725c2cfc558fa7606707bbcfa465960e47f7ded358
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a potential phishing lure related to an audiobook. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=we+zamyatin+audiobook
    • https://cdn-cms.f-static.net/uploads/4446283/normal_5fe6947f6ae55.pdf
    • https://cdn.sqhk.co/mofosalamo/QJiebyk/lutojififojimanolowopelo.pdf
    • https://cdn-cms.f-static.net/uploads/4426547/normal_603ac4cbc7ab7.pdf
    • https://static.s123-cdn-static.com/uploads/4385434/normal_5fc73ddd94ec1.pdf
    • https://static.s123-cdn-static.com/uploads/4392860/normal_5ff6c3f868205.pdf
    • https://cdn.sqhk.co/movumatoz/jfjhmqC/wituritibijofenewidenivu.pdf
    • https://static.s123-cdn-static.com/uploads/4451374/normal_5fe25fecc1650.pdf
    • https://cdn-cms.f-static.net/uploads/4379854/normal_603a6388eb060.pdf
    • https://cdn.sqhk.co/manowipete/EjhehjD/rejubifipejaletisubana.pdf
    • https://cdn.sqhk.co/lukedivibeb/KhbESVu/tower_of_heroes_roblox.pdf
    • https://static.s123-cdn-static.com/uploads/4391013/normal_5fe4d24c28d09.pdf
    • https://cdn-cms.f-static.net/uploads/4489241/normal_6045c0e717f45.pdf
    • https://cdn.sqhk.co/puvubuzu/e8oQ7ih/msc_international_business_management_salary.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_4a62b4a4f0cb44d98edcf4b5ccf54a67.pdf?index=true
    • https://704d67de-a0ba-412a-a77d-f8c4cf0d88a3.filesusr.com/ugd/a83d94_8a525648c33146cc91bda87bd9ea0afd.pdf?index=true
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_d5023850258f441ebeb1519dc47c65a2.pdf?index=true
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_441adb1381e1485fa8452e90db8f9627.pdf?index=true
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_41561e1f722545dda89236e3648358f8.pdf?index=true
    • https://s3.amazonaws.com/xuzed/rozefutufusurevuzobipatup.pdf
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_57b558e398034184bc492357ee91eb3a.pdf?index=true
    • https://1df32be7-5e6a-491e-80e4-5c558052ef26.filesusr.com/ugd/e02e08_29e586d52c9b4325949611e38bbe59da.pdf?index=true
    • https://s3.amazonaws.com/fekazudabo/asean_integration_2018.pdf
    • https://s3.amazonaws.com/xewamejixolefaj/manualidades_rosas_con_papel_de_seda.pdf
    • https://s3.amazonaws.com/jowutoneranemuk/photoshop_digital_painting_brushes.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_off000101d8.bin
45d37ec179b81f0e913cd3a1660685a3c3e5ac51a3b770e6a96f821a38e952a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 5032 bytes
font_01_sfnt_off00011309.bin
125adaf1980380eed88e603736cabcf433be274457d0369ed34a0cb121ef1597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11309 10816 bytes

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