Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b0780e2abdf7284…

MALICIOUS

PDF

70.2 KB Created: 2021-03-15 05:22:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: a16e8fc8a0ef7eef46cc7032c8b94061 SHA-1: 4e9fe226966a84f9b1dd0998177cb67f96070397 SHA-256: 2b0780e2abdf7284c5a66fae8db3d8e2c0b61702c210a82bd1ec1bb6a43937b2
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a mass of external links, suggesting an SEO link farm or phishing attempt to direct users to malicious websites. The embedded URLs, such as 'https://kuzutuzo.ru/award?keyword=pulse+width+modulation+nptel+pdf', are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://kuzutuzo.ru/award?keyword=pulse+width+modulation+nptel+pdf PDF link annotation
    • http://pidusejop.medianewsonline.com/raquitismo_e_osteomalacia.pdfIn PDF document text
    • http://xivekoto.medianewsonline.com/angular_7_tutorial_point.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417312/normal_5ff2c67ead245.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/how_to_add_if_yes_in_google_forms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418574/normal_601de57e36185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481676/normal_5fe146eddb87b.pdfIn PDF document text
    • http://wodedutipif.medianewsonline.com/retusugomuxare.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/nejazuresolukox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0385828b-4d1c-45d9-a5ac-01a9cf49e3e5/92745474912.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/annals_of_mathematics_and_artificial_intelligence.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/delolaf.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/64369958029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0985e0-c748-4a40-ac83-8f8cfb78015d/jezura.pdfIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_a94d6b5db8294a8ea3e0840f0ddc412d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rerinago/bcs_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/susupukorimukesenajugofog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/419e3d0c-541c-40e1-a9e3-0eb9c8b47848/she_stoops_to_conquer_novel.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/tixepogukusixoxifufa.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/audible_audiobook_format.pdfIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_c0654b00b0304ca9bdde97bf399b0a83.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab339bfd-8dee-43d0-9bb0-e452b7fbfe88/unication_g1_pager_belt_clip.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_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 5276 bytes
SHA-256: 323b21ab2a07f19797170c0d417a669eb6d3af5b7b04934ba980e076709cb2a3
font_01_sfnt_off0000e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 10544 bytes
SHA-256: c9bdecb30acfd837d7b60a46dfa76b225b407ff5ed5b69796ac6f28d71c09c85

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