Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0cb52273a9fee53…

MALICIOUS

PDF

77.8 KB Created: 2021-05-23 22:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7beded7f87b515287e5b1b3a5d5f7336 SHA-1: 3ab545180355a0c9643ca3432db66e73f322b192 SHA-256: d0cb52273a9fee5399189e3e95efbcfb0464f59df7528b4be8b3cbe1a2e18ae4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=como+se+simplifica+fracciones+algebraicas PDF link annotation
    • https://labaveboto.weebly.com/uploads/1/3/4/6/134611097/tafedoliwiledabufi.pdfIn PDF document text
    • https://dawoxojukuput.weebly.com/uploads/1/3/4/8/134890950/2259690.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/3312095.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/xalasawu/52567199237.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/96490520078.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/76567463163.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/wced_e_recruitment_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa3fc729-0d16-4710-ae97-a4ae1a89e97a/17373181558.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/mansions_of_madness_app_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/73319836463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ca71a0-a2d1-4407-a6d7-2e9b7af2ca46/matricom_g-box_q3_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89332aa4-a3a1-4929-b815-2297aa36b238/sirijir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fe5d70a-1eba-4ef3-8fe1-b0f05f804c4c/john_deere_115_automatic_belt_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bb01b2a-4cd0-41db-bb10-e322b1b275bd/insinkerator_evolution_parts_list.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/retege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d8b63ba-6840-48d3-9c65-dbb317935a44/how_to_start_a_short_film.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9c1c76d-9e78-4d33-8524-1512e0b30143/fubepomejexorosota.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/47803927777.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/coming_out_on_top_guide_alex.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_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 5380 bytes
SHA-256: a1ff6c60735a6a0e5dad4a11b5ec67bc4be353487a336f69b2a771826ee89a6c
font_01_sfnt_off000100dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DC 12020 bytes
SHA-256: cb077c9252856d69f552642176e74f474fab21871b291e010a914e3ba2327111

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