Malicious PDF — malware analysis report

Static analysis result for SHA-256 55597113820d2c56…

MALICIOUS

PDF

82.4 KB Created: 2021-01-13 15:50:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 68dd47058c8a3ccb665ce569228811fb SHA-1: 51cc0f0060f2e2198cdb79956026697c902f0caa SHA-256: 55597113820d2c563116dd693f0c7412c0eaa5b33c91f5625ceb83469ee2d4c7
214 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, and it contains multiple embedded URLs pointing to potentially malicious redirectors and link farms. The heuristic firings indicate the PDF is designed to link to external content, with one URL specifically related to 'amazon fba cost spreadsheet', suggesting a lure. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

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/aws?utm_term=amazon+fba+cost+spreadsheet In PDF document text
    • https://cdn.sqhk.co/gevajoke/jQU5hbY/contact_football_agents_in_europe.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/xvhbhgg/podezixuzufopulipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5f88a876b905b.pdfIn PDF document text
    • https://zamomojufowa.weebly.com/uploads/1/3/4/6/134613680/1919281.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374021/normal_5fca7d4a79589.pdfIn PDF document text
    • https://site-1176001.mozfiles.com/files/1176001/70939075365.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/midizaxopazeji/64693297212.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/kapapuvijozu.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/wesipijinatinivaruvem.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/pathology_bangla_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/bumblestripe_warrior_cats.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/graph_linear_equations_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/93930285283.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/blank_clock_template_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/lowapuxoduver.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/early_college_academy_ga.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_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 5540 bytes
SHA-256: fe737ed55374bcc4c9289c6521184bfbaf5d13dfdf4ee70c02e1e3390d812359
font_01_sfnt_off00011687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11687 11120 bytes
SHA-256: e9fc23da4666a3d95fc1622cd6f5162d8d882264ce0616caa5912fb4796a2706

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