Malicious PDF — malware analysis report

Static analysis result for SHA-256 85763ab03ddc2fdc…

MALICIOUS

PDF

79.5 KB Created: 2020-12-05 11:24:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c01bc222b0d29186baefcba632b9bfa8 SHA-1: 6121eb11e18d6af053886e6513d9e2bdefa3dfe9 SHA-256: 85763ab03ddc2fdc7c1282d25db2727cf75f2791dfb01aecb8bfafa384fad61a
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 at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate this is a malicious redirector and a link farm, suggesting the primary purpose is to direct users to potentially harmful sites. While no scripts were extracted, the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/aws?utm_term=allah+allah+ya+baba+original+song
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/1864333.pdf
    • https://zebamejiwan.weebly.com/uploads/1/3/4/3/134312785/vakasatamun-lukaliwotufe-sumilemosogik-jumegobululena.pdf
    • https://nakaleraba.weebly.com/uploads/1/3/4/6/134606700/xakofibotezenof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc3375b12facd59cebbf51f/t/5fc48594cb3e0f5771e06c8a/1606714775495/insignia_ns-40d420na16_review.pdf
    • https://static1.squarespace.com/static/5fc527cf084698658e79f80f/t/5fc63e95f81c9a2a0c7814c2/1606827670365/odd_eyes_pendulum_dragon_limited_edition.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf104edabee7b440646b3/1606217988705/89049688888.pdf
    • https://uploads.strikinglycdn.com/files/76416067-0df2-4095-b093-8b5530b18339/make_your_own_connect_the_dots_printable_free.pdf
    • https://uploads.strikinglycdn.com/files/8ec0d11c-c686-49eb-ad16-f21b658f935c/bypass_dor_de_cirurgia_aps_bypass.pdf
    • https://static1.squarespace.com/static/5fc0f7fbe9fc3622d5227cd2/t/5fc2b7aceaf37e3b64f5e03b/1606596525453/designated_for_assignment_list.pdf
    • https://static1.squarespace.com/static/5fc5a999c14dfd36fe120027/t/5fc8aec27ff5a343ebfb1054/1606987460981/capitalist_meaning_in_urdu.pdf
    • https://static1.squarespace.com/static/5fc3a28aaffbf90a66fb884b/t/5fc524ad5147b14804d766d5/1606755501558/amcas_transcript_request_form_not_working.pdf
    • https://s3.amazonaws.com/dazovosugev/muluzux.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5c4.bin
9cd0138e7df3958f1fb8cd77266718fedf6efae51cc5fe20825b9d7657236ede		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C4 5180 bytes
font_01_sfnt_off0000e764.bin
83b3cce47f6f1b17411905dd6ceb8ffb3636ee6c3c6efb2bf9cf0faf46809a40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 14064 bytes
font_02_sfnt_off0001139e.bin
0c9fbfa3537c5498fc1dcc8bedf8441542c07968092bb2eb06eb6acc1d7ea468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1139E 18824 bytes

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