Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2c6757895e0501…

MALICIOUS

PDF

83.0 KB Created: 2021-01-14 11:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: baa3bbd1b4a7af54ff466d45784fd20f SHA-1: eeb82b5d69adc139c4d83c5aa50e055dbe1024ff SHA-256: 9a2c6757895e0501b8c96f5540ec4d9a87b8db0b0a78e7039d13ccffa83edc16
214 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 link farms and redirectors, indicating a malicious intent to distribute malware or phish users. The ClamAV detection and ML classifier further support its malicious nature. The document body, though heavily obfuscated, appears to be a lure related to an 'algebra 2' worksheet, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/aws?utm_term=linear+programming+worksheet+honors+algebra+2 In PDF document text
    • https://nuvetifozeg.weebly.com/uploads/1/3/4/3/134358797/temoruzetupedowelibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407081/normal_5fba4bb31fa9d.pdfIn PDF document text
    • https://site-1174390.mozfiles.com/files/1174390/power_warriors_12__0_apk_mediaf_re.pdfIn PDF document text
    • https://site-1168172.mozfiles.com/files/1168172/horror_movie_sound_effects_download.pdfIn PDF document text
    • https://wemeguxenuvoj.weebly.com/uploads/1/3/3/9/133999449/7542222.pdfIn PDF document text
    • https://najonetawo.weebly.com/uploads/1/3/4/5/134522785/0e6ffc34a218b.pdfIn PDF document text
    • https://bajomunimiru.weebly.com/uploads/1/3/1/0/131070213/relosa.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/pukasojalu/rukonu.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/9638496864.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/96559239807.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/fugatomedumas.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/98908661221.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_off00010776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 5604 bytes
SHA-256: e84f8342a154c3ea5ae8255b4c7f017cc0504f2f398d8f5c26953b680ecfa6db
font_01_sfnt_off00011a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A76 10676 bytes
SHA-256: fff72576ff2cb3535762b8746640a81c10c7560e00c4d71bdfd9f8f0890a1306

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