Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6f97c5876bff49…

MALICIOUS

PDF

68.7 KB Created: 2021-01-21 19:39:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 398e390fb65bd45a13fffb480b2c05e3 SHA-1: 47d825c8110930b91c0093e125dee87c6e13caf7 SHA-256: aa6f97c5876bff498b7e6d03946f45953dcb00469a76ea36d984d69912fa415d
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search results or distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=que+es+el+sustantivo+en+una+oracion In PDF document text
    • https://cdn.sqhk.co/xibumediw/3ohj0hf/58157306071.pdfIn PDF document text
    • https://gewewipuno.weebly.com/uploads/1/3/0/7/130775766/4710243.pdfIn PDF document text
    • https://nutomejeti.weebly.com/uploads/1/3/4/7/134702699/19d0bd6765c.pdfIn PDF document text
    • https://retarabad.weebly.com/uploads/1/3/3/9/133997928/3989027.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/EhifVib/cnc_machine_tools_price_in_pakistan.pdfIn PDF document text
    • https://gariligiradafa.weebly.com/uploads/1/3/4/0/134041078/9939044.pdfIn PDF document text
    • https://site-1177705.mozfiles.com/files/1177705/bitmap_format_in_computer_graphics.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/iT5gchf/ark_basic_survival_guide.pdfIn PDF document text
    • https://nusesosof.weebly.com/uploads/1/3/5/2/135296084/dimarinejipon.pdfIn PDF document text
    • https://cdn.sqhk.co/zokelofid/Bfmibqf/naughty_boy_lyrics_pentagon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://karifopiti.epizy.com/aiou_admission_form_autumn_2019_last_date.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/netbeans_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/handwritten_character_recognition_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/tisesuxix.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/chicago_format_in_text_citation.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/saga_de_androides_dragon_ball_z.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_off0000d051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD051 4916 bytes
SHA-256: 1fac0b8cb3756ad37053234c38908c479b93df381085b70347a50a627e7f7138
font_01_sfnt_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 11284 bytes
SHA-256: 3cd252c3bce3bd32966d2f4c5bd921e0ae572e7739bb65a2df2c4ea7d4c5874c

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