Malicious PDF — malware analysis report

Static analysis result for SHA-256 70525507a9947606…

MALICIOUS

PDF

73.1 KB Created: 2021-02-16 20:08:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b1fbf000f308b554fb2595675d15c820 SHA-1: f236d643e402ebda92efac77292a17642ff4acb1 SHA-256: 70525507a99476060ee75112e41a8e67d362892687b163d9e33e85d7b2635768
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, identified as a link farm, with one URL pointing to a geometry worksheet. This suggests a tactic to manipulate search engine results or phish users by disguising malicious content as educational material. While no scripts were directly extracted, the PDF structure and the presence of numerous external links indicate potential malicious intent, possibly involving embedded JavaScript for further exploitation.

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://druttle.ru/wix?keyword=geometry+sohcahtoa+worksheet+part+1 PDF link annotation
    • https://nivikaxixigimom.weebly.com/uploads/1/3/5/3/135322477/0e0ed1d.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/Agdjbjf/kiluf.pdfIn PDF document text
    • https://pabametutib.weebly.com/uploads/1/3/5/3/135317572/lebotememe_jasalarewajoja_nudoteledumozu_putexafadi.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/fudifewedek.pdfIn PDF document text
    • http://antonioit.fun/vorerobemegexejebimudejo81nic.pdfIn PDF document text
    • https://cdn.sqhk.co/gupetipek/9iaqgjf/snake_world_record_game_cool_math.pdfIn PDF document text
    • https://rixevabibevata.weebly.com/uploads/1/3/2/7/132710753/f158c0309258a.pdfIn PDF document text
    • http://fimewot.xyz/good_phrases_for_informal_letterbkuq8.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/gx4JaLd/airplane_movie_online.pdfIn PDF document text
    • http://bunnygummy.ru/51744169245drnl3.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/vigevot/bluestacks_free_for_pc_old_version.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/1334134050.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/dark_background_hd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/rbi_guidelines_for_inland_letter_of_credit.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/purogugotufedavegamuroz.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/teacher_evaluation_sheet_for_project.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/ap_biology_lab_report_format.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_off0000e0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B3 5480 bytes
SHA-256: fbc0b85161df3c4ca6884a4b60432b249adecb82e8a22187f492dae2254dc538
font_01_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 10608 bytes
SHA-256: b9b97dbe447dc22ad9dfef76704604554a7844733dd818b4349f58d83ea89794

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