Malicious PDF — malware analysis report

Static analysis result for SHA-256 850afcb811493273…

MALICIOUS

PDF

66.2 KB Created: 2020-12-17 03:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6204a1b699ba56d853e1dd5e86ff302b SHA-1: 93dfe57c905f3ceed742c1fc6920c8e614ecda3b SHA-256: 850afcb81149327367a4c804bb586dd7b1b5766b5ca9d3e1546677e97ed94d3b
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically `https://gettraff.ru/123?utm_term=independence+university+scams`. The presence of this malicious URL, combined with the ClamAV detection of 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to "independence university scams", reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://gettraff.ru/123?utm_term=independence+university+scams In PDF document text
    • https://jokepalebaja.weebly.com/uploads/1/3/4/3/134360350/kemigosufamapu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc7a03b849d1727bc1377d2/t/5fc90688a998cf1e25ffc298/1607009929396/41921185566.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc39939a879396864191ab0/t/5fcf1c957cc0b10a0aca2fea/1607408789761/74806910427.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3676dc6d96458363207a7/t/5fd0626306d21916ed6c4ff7/1607492197263/defebedaleniluxo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcee6a2c6de34c7a377ae1/1606217323200/mefomodeduf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca29c8a7-9ce1-4711-a115-6af8db740ec1/legend_of_korra_turf_wars_1.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f6bd5687f52b6b817d01/t/5fc32d899d79364840f59d44/1606626698438/85048258767.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f24c403f5353fd95fd42/t/5fc54c59e18c5c478ea9f1a3/1606765661530/you_wa_shock_lyrics.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fb6b88c99b6d37a78a63/t/5fc3e9985147b14804ab51de/1606674840454/microdermal_jewelry_tops.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_off0000c75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75C 5284 bytes
SHA-256: d897d5e077e33b910771c34cfdd1667e74e40e3a4784579fd74cf21ac49468f9
font_01_sfnt_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 10396 bytes
SHA-256: c36f2685c70ac22fbb189baa50e7832c902ba47bd8cac804f4bfe86fc1b8a7f8

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