Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe15307f2f46fe71…

MALICIOUS

PDF

103.6 KB Created: 2020-12-13 22:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 786866978c6207911ad22ec347ec1b03 SHA-1: 1d959aa80196a6f572339f887aba704a4453ea5c SHA-256: fe15307f2f46fe71f003303bceedf07f059901b3daba69ae58787a4e6484fafe
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document exhibits characteristics of a link farm, containing numerous external links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample, but the extensive link farm suggests an attempt to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ggtraff.ru/aws?utm_term=bd+3gp+natok+free In PDF document text
    • https://tubumafipe.weebly.com/uploads/1/3/4/4/134458357/wagaletixumil_lijoxibiwo_vaporixapewi.pdfIn PDF document text
    • https://xuvarilanagore.weebly.com/uploads/1/3/4/4/134470983/zofanopixipizid_kuzuwarobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_5fb28103be993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f8f5ff500831.pdfIn PDF document text
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/baropesawubora_wapuzimisos_gikapusetuxiw_zobirevipugo.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/telasebisu/zubenujabetozidiz.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/58831515638.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5add2104edf1d77a1d016/t/5fcc3eb72bc7884852a7ccff/1607220920001/baixar_pixel_cup_soccer_2016_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f1884d5-1aae-4630-9fe0-68de0679ae42/jarutotixolonefi.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/metformin_hydrochloride_tablets_ip_850_mg.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/moxazimomikafube.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13149 5276 bytes
SHA-256: c41fca43853c8b4b6d9e95c940893f0db6049641c6b27c86bdd51ad82fb576f3
font_01_sfnt_off00014359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14359 13132 bytes
SHA-256: cee347cec6278c1c0710454a0d9170a3b5c9436857b4cac53f8043edf3a6ed36
font_02_sfnt_off00016ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CA4 11676 bytes
SHA-256: b2779e539344e269950cb777183f6e0366637ffcfce6ea45448f17701f541b63

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