Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d83beaf683768a…

MALICIOUS

PDF

77.0 KB Created: 2021-03-06 05:56:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: da4d4e788ca949f1b784235159ef975a SHA-1: cfc6fb1717707a8b98a978242ecb804ab027dc91 SHA-256: 13d83beaf683768a0ba415993a3e30475a6b263e2f2b91473c89483adc86dece
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to seemingly unrelated PDF documents, indicative of a link farm or SEO poisoning tactic. One prominent URL, 'https://xezojetit.ru/strik?utm_term=what+is+morning+journaling', is directly embedded and likely serves as the primary lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the embedded links.

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://xezojetit.ru/strik?utm_term=what+is+morning+journaling PDF link annotation
    • https://bunonosuvon.weebly.com/uploads/1/3/5/9/135976801/1039452.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486566/normal_5fcd8e2396b47.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/R46iekK/minecraft_java_edition_cheapest_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_60148bff5db67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452372/normal_5ff31ac021b3e.pdfIn PDF document text
    • http://konalofasu.mywebcommunity.org/edtpa_task_2_instruction_commentary.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/kesorujometamugamiwatewad.pdfIn PDF document text
    • https://cdn.sqhk.co/suvotoruwot/2hhnyhe/apple_trojan_virus_warning_mac.pdfIn PDF document text
    • https://mavipevawifuduv.weebly.com/uploads/1/3/4/5/134598931/tavezobefaxova.pdfIn PDF document text
    • https://cdn.sqhk.co/ropimipaf/igjNrjc/25311908450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403822/normal_601398f35e270.pdfIn PDF document text
    • https://gizivesokopupa.weebly.com/uploads/1/3/2/6/132696604/69dfab46fe43980.pdfIn PDF document text
    • https://wotopegajoxife.weebly.com/uploads/1/3/4/0/134042499/472812.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/julexekubaj/definisi_agama_menurut_sarjana_islam.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/kezawixiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/alphabet_anglais_prononciation.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/28300314633.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/54537815016.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/6478065809.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/what_a_wonderful_world_organ_sheet_music.pdfIn PDF document text
    • http://luxupuxud.myartsonline.com/gowesujativunoguwek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51B 3164 bytes
SHA-256: 69a70dfeb423a83cbb6d151f1bd3425619cc152c570f311b4d639f94038d6e9a
font_01_sfnt_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 5188 bytes
SHA-256: 96e3ec580a65df86c93376dab1789970f897979cf6e3d92b8b5a1d8332d9988d
font_02_sfnt_off000101d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D2 10648 bytes
SHA-256: 8acfe23c4d27d390277a54bbfadf93c3cfddca2d2fed7901b17a51921d14c0e6

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