Malicious PDF — malware analysis report

Static analysis result for SHA-256 b055b507b2ae731a…

MALICIOUS

PDF

73.8 KB Created: 2021-03-30 08:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e194fbbdc4cac8bea426601a39de6b1f SHA-1: 26a0df8e52849b620e49184baf917a0080049be1 SHA-256: b055b507b2ae731a8e408adb2598edc05a6ac825181d926a89b1785d13b960fb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://nipisod.ru/strik?utm_term=one+day+in+the+life+of+ivan+denisovich+themes', suggests a potential phishing or malicious redirection attempt. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nipisod.ru/strik?utm_term=one+day+in+the+life+of+ivan+denisovich+themes PDF link annotation
    • https://jixerunoxeza.weebly.com/uploads/1/3/4/6/134678785/99b4f7f3.pdfIn PDF document text
    • http://disclosures.space/mr_bowman_s_entertainmentrwgc9.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/HjdF9Az/battlelands_royale_pc_indir.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/texas_holdem_poker_hands_odds_chartv628n.pdfIn PDF document text
    • https://cdn.sqhk.co/radojiga/1dUhdjj/guided_meditation_mindfulness_of_breathing.pdfIn PDF document text
    • https://dobajipewaxegas.weebly.com/uploads/1/3/4/6/134605260/wunegegagiduzu_gazizigubolu_radesabatesovo.pdfIn PDF document text
    • http://jobs-ingenieur.best/88991167613s32am.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/begijufadi/dokimiwatudenug.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/craftsman_17.5_hp_riding_mower_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/45064612105.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/java_ireport_subreport_example.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/gita_press_bhagavad_gita_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/how_old_are_the_characters_in_war_and_peace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b16032d3-9aa1-4446-afd2-3e2d0eb69324/la_biblia_hablada_exodo_25.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6266803-5c6e-4bd7-aa82-92433eb228e3/how_do_you_measure_lifelong_learning_is_important.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_off0000e1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D3 5356 bytes
SHA-256: 8727eba90b35c4eaf7d3ca82cf328ca34160af730fda36e3e28c50c402b2f855
font_01_sfnt_off0000f3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 10740 bytes
SHA-256: 81212ff6794bcb7e60f8a3c7fb34457f41399d17ac9f59aeceb65d1393f35843

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