Malicious PDF — malware analysis report

Static analysis result for SHA-256 76573620be52044e…

MALICIOUS

PDF

44.0 KB Created: 2020-07-14 05:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f31268d9f2e711e55d06b0306d2b2bf6 SHA-1: 306adc4d4f78c789710b55d670c335ab33589cf3 SHA-256: 76573620be52044ecf502fa750e288adad248f3f5adf970a688f17e38d7b4b36
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV also flagged this file as malicious. The embedded links likely serve to direct users to malicious websites or to distribute further malware, aligning with a dropper or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-9118314-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9118314-0
  • 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://ttraff.cc/wb?keyword=worksheet%20for%20kg1%20free
    • http://files.camppepper.com/uploads/1/3/2/3/132302913/1217584.pdf
    • http://files.windhorseadvancedhealing.com/uploads/1/3/2/6/132681634/10a08d2a42c2.pdf
    • http://files.425sqn.org/uploads/1/3/0/8/130814642/zotazaboma.pdf
    • http://files.cmenergyinsight.com/uploads/1/3/2/7/132740716/duligojifa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://womemoz.files.wordpress.com/2020/06/nixupowasuweguve.pdf
    • https://digogaba.files.wordpress.com/2020/06/94950999511.pdf
    • https://puvudoxewe.files.wordpress.com/2020/06/47700061204.pdf
    • https://xebiwabas.files.wordpress.com/2020/06/84579355052.pdf
    • https://lusigezoxot.files.wordpress.com/2020/07/zivubozekevozafefivitoraz.pdf
    • https://ruvirimijoxi.files.wordpress.com/2020/07/molega.pdf
    • https://petudelixax51916226.files.wordpress.com/2020/07/nutodexobuzujaw.pdf
    • https://sotarobimubu.files.wordpress.com/2020/07/96965681139.pdf
    • https://zevazodofo.files.wordpress.com/2020/06/67062319089.pdf
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/25990063655.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/49837227919.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94393320092.pdf
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/99951020086.pdf
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/woruwokiregizibo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9401/6157/files/42206928117.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/libure.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000716b.bin
8e1bc43d5220f4808107de189aea35bf71838fbca2ae848fbbab86405112d2ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716B 4548 bytes
font_01_sfnt_off00008111.bin
d6aa005f9462f7443e55fb5d042c711b15ef3e8594970d0ec6025bde984d159d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8111 9884 bytes

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