Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c243ff64d2ebf5…

MALICIOUS

PDF

108.3 KB Created: 2021-04-11 06:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1203bcdf1765df6873681c2f2b274a09 SHA-1: a195b662f96ee79d49007a7dc5fb49c4f274d786 SHA-256: 01c243ff64d2ebf593b8d6bc0d3dcc273aa644744018f0fa06fc0064d2443c26
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as book downloads, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation of PDF vulnerabilities or social engineering to lead users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://botokaw.ru/strik?utm_term=libro+metodologia+de+la+investigacion+sampieri+4ta+edicion PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375342/normal_5fe187ba50a1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_606a82c91d1a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501029/normal_603c81b7b1bdd.pdfIn PDF document text
    • https://zemabata.weebly.com/uploads/1/3/4/6/134677216/c8524.pdfIn PDF document text
    • https://wotipivas.weebly.com/uploads/1/3/1/4/131482993/ee93415.pdfIn PDF document text
    • http://ezfix.asia/nuxasibawnn4r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426686/normal_6068778fd0a27.pdfIn PDF document text
    • http://rezotu.xyz/xixeramafowafuruvojazamk7yys.pdfIn PDF document text
    • https://dagojamigim.weebly.com/uploads/1/3/4/7/134763314/sifixuwet.pdfIn PDF document text
    • https://tinofapilasi.weebly.com/uploads/1/3/4/5/134518201/pawuxa-bupufefegodaxe-tugurer.pdfIn PDF document text
    • https://gatilavim.weebly.com/uploads/1/3/4/3/134391542/rekujagipa-ritotuwu-powili.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/watajive/bizixuga.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/perfect_ed_sheeran_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/waveform_analysis_machine_learning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df68cfee-05d8-4042-a94b-9d5d69c77611/how_do_i_change_home_address_on_garmin_nuvi_50lm.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/kajonajimofo.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/final_fantasy_xv_comrades_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/merufusojekosep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bdd34fe-2a2b-43a0-b0df-57776416e368/66908974664.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/1019963415.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/36067483726.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4B 5624 bytes
SHA-256: 04d74c2336691cf560359293b88607f21b06c903b0556d1e30263aa1b9e665ba
font_01_sfnt_off00016160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16160 13368 bytes
SHA-256: c6cb5640485d6ea3b64acb7da0dfe13751cec092a92915e29121ed71fd712025
font_02_sfnt_off00018c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C3D 16084 bytes
SHA-256: 492b72e9e8f0bcef963ad10e88f80b5598216a8c56d4f3a27963a6a5716a4957

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