Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25d8d34b20257c8…

MALICIOUS

PDF

88.3 KB Created: 2021-01-03 08:51:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 653c43875f638a08624624f2c5f1592c SHA-1: 70c95042309705c075ec3f813ec976ffed213bbb SHA-256: c25d8d34b20257c89dfa1398b378c27388415c8dc6790658b9c5c2a2feac537e
252 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and one link to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=nmsua+campus+map In PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/29a01f541f658.pdfIn PDF document text
    • https://damasidegiked.weebly.com/uploads/1/3/1/4/131411688/vekavip-kabojatusuzex.pdfIn PDF document text
    • https://pesadoxemanuz.weebly.com/uploads/1/3/4/8/134852899/8199161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403418/normal_5fa1176d3709d.pdfIn PDF document text
    • https://nobigezikol.weebly.com/uploads/1/3/4/3/134308489/pufokinuxidur-riwesuzipopimu.pdfIn PDF document text
    • https://gupupekulumo.weebly.com/uploads/1/3/4/1/134108922/novalapokerig_zubinatud_zexexo_baruzibotasubu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba39f6e8-1ca1-49cb-bad1-916d03abfd4d/mufonejuvuvalatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/842bf800-a0ff-45f3-9ed2-4a8961508098/24593732310.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/best_android_app_maker_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7431a77b-c42c-4189-aebc-d96552d3aae8/bebafonufipevo.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/migaziziwuradikesadak.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10051 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off00011014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11014 2920 bytes
SHA-256: a986119c16e44081cc8e25afede66da4c613bf9b2bda1169c6dfb8b692a7cff1
font_02_sfnt_off00011a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6D 4920 bytes
SHA-256: b4562889884aacbacdd0969d92df62a73487d80c1fef12f5dae7b9575df6fc5d
font_03_sfnt_off00012b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1D 12828 bytes
SHA-256: ece53a6beafafe11dfcd46728883f759f1141d6382170b4c228a63280f510ce7