Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73e47c631ba97e7…

MALICIOUS

PDF

72.6 KB Created: 2021-03-26 17:08:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a4edd83f0286b8e086bdcc9d8a10bc6 SHA-1: bb1ed856461eed69be5bf4432f1617e0aee0a631 SHA-256: e73e47c631ba97e7258c5bff7806acd9b589ec5e9beb241fa91f5bb3761df672
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate a potential for malicious content delivery or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/award?keyword=5th+grade+math+enrichment+worksheets+pdf
    • https://mogarujatokeduw.weebly.com/uploads/1/3/5/3/135324664/sewekoju.pdf
    • https://cdn.sqhk.co/wisewuguv/iMrUprh/throw_down_take_a_sip_dance.pdf
    • https://pudonaneguk.weebly.com/uploads/1/3/4/7/134767047/6757060.pdf
    • http://koxelovanalimu.getenjoyment.net/bekalan_air_bersih.pdf
    • https://cdn.sqhk.co/desogepupema/gjjgyIE/steam_spacewar_cracked_games.pdf
    • https://rijamukomebojo.weebly.com/uploads/1/3/4/5/134585881/4d6f765f6a.pdf
    • https://cdn.sqhk.co/fefowofuk/hcgdpVj/89395200606.pdf
    • https://vilawamilufulob.weebly.com/uploads/1/3/6/0/136006615/4993114.pdf
    • http://jetinaxisodew.mypressonline.com/luseju.pdf
    • https://tezanifarepuji.weebly.com/uploads/1/3/0/7/130775277/0e70a950b774d.pdf
    • https://geliwesirodired.weebly.com/uploads/1/3/1/3/131382982/vijifejigu_sukemupi_zipuri.pdf
    • https://vonulimuwudepaf.weebly.com/uploads/1/3/4/1/134131723/5172865.pdf
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/sanerijisipexuki.pdf
    • https://cdn.sqhk.co/puzafusabuw/fheifET/52795455485.pdf
    • https://kopomitesukov.weebly.com/uploads/1/3/1/4/131453216/3216507.pdf
    • http://dotenipago.medianewsonline.com/esterification_of_carboxylic_acid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/42cb4553-0bbd-42ec-b25e-f355d4d42543/zigutipebodenanim.pdf
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_e9dcdf47cbf24419b848411391300509.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a08fb662-78c3-4cd8-a2fd-c64686bf662e/65194590345.pdf
    • http://sewujajapivix.onlinewebshop.net/38213611724.pdf
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_a9c56926021b406da1a504af8043223b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/83b8da11-4205-424d-8b02-299125054e8f/zurorav.pdf
    • http://xunudijumo.myartsonline.com/bossypants_images.pdf
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_4339788582c143b7b2c0625c3434d74e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/76206149-fb86-4959-9926-3313fd8f01f2/biblia_de_jerusalen_gratis_descargar.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda1.bin
a73e115629c9386b588ebdd4cebfda37e34eb4126a906051e1f776babd01d544		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA1 5724 bytes
font_01_sfnt_off0000f108.bin
5743616b591204b278fe0b8635c1a7551d4781f416abd0dc5797276bc48983ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 10348 bytes

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