Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed73efac9abca7a…

MALICIOUS

PDF

74.3 KB Created: 2020-12-20 01:06:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 284690ebad418a7c53ba04191c46177a SHA-1: e250acb2bc433ed72a697ebd91f6fcb54b122c4f SHA-256: 6ed73efac9abca7a9c021612928c7a789c613a648fe2e22949fce8d17eb4472f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a heuristic firing indicating a link farm with numerous external PDF links, one of which is a suspicious URL. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of a large number of external links suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/strik?utm_term=revetments+cost+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470979/normal_5fad3eedc539c.pdfIn PDF document text
    • https://kefelewupu.weebly.com/uploads/1/3/4/7/134711224/8e4511516.pdfIn PDF document text
    • https://nowusunomotir.weebly.com/uploads/1/3/4/3/134314498/41e3b2f476909.pdfIn PDF document text
    • https://milavigik.weebly.com/uploads/1/3/2/8/132815866/vevulutuwesuve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476582/normal_5fd281d109af8.pdfIn PDF document text
    • https://fuwelobuzade.weebly.com/uploads/1/3/4/6/134649994/f768f699998770d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0d8e2a13a450babf3c347/t/5fc5ef27a97599144ec5fe86/1606807335956/mill_utilitarianism_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/augustine_city_of_god_book_19.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cb2e32c-69d7-4e18-9f92-f488d5bbd698/legion_of_azgorh_tactics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9f03a29-9c6c-45ad-a169-cb56717810da/79722112255.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/photoshop_3d_text_effects_plugin_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/gixumixosugupex.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/financial_aid_answers_for_coursera.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b26e405d5340f3353adc/t/5fcc55c705ddc9599d16ef54/1607226824164/luxutapuvufari.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB82 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 4736 bytes
SHA-256: 68985c5ed201b2e70c3552f77b4b8b92e377fbeee7f7f93fe7708b80f633c1cd
font_02_sfnt_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 2092 bytes
SHA-256: 13678a14b930e6d42e11b2ac41b13981c2c7f5938cc30cfb194ad51886f1f1dd
font_03_sfnt_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 10904 bytes
SHA-256: 250965998ba640bc19c293a8d6ab6056087f622ae81e85f8e0062bedd60e25db

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