Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf3e165be67a375…

MALICIOUS

PDF

76.8 KB Created: 2021-01-17 21:21:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d46487bccee7f12b50893c2d1fda178 SHA-1: 2827192fd20d1a70d223ebe192e2ba902462fda6 SHA-256: ecf3e165be67a37561567ff9325c3d990c43f9f2aa43b9da882a038996f75935
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a PDF link farm. The embedded links, such as 'https://gettraff.ru/123?utm_term=the+horse+anatomy+plates+for+artists', suggest a phishing or spam campaign aiming to drive traffic to potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/123?utm_term=the+horse+anatomy+plates+for+artists
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/e79830.pdf
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/8b1ff250f1423.pdf
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/xerudun_giparobigi_gafodaratizokis.pdf
    • https://zaxefuki.weebly.com/uploads/1/3/5/2/135299090/sijebelut.pdf
    • https://sidomepavoresob.weebly.com/uploads/1/3/5/3/135322675/5064198.pdf
    • https://kapekutom.weebly.com/uploads/1/3/4/4/134437999/zuposafamiran_tirid.pdf
    • https://site-1168129.mozfiles.com/files/1168129/facebook_marketplace_stamford_ct.pdf
    • https://bimidupixujeg.weebly.com/uploads/1/3/4/3/134319160/kogevo_tepujoxefudip_rupisizij_kemelonil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zifilobesumafi/android_auto_update_some_apps.pdf
    • https://s3.amazonaws.com/belopudevuzuza/1037485480.pdf
    • https://s3.amazonaws.com/sakaburepagase/albert_camus_la_peste.pdf
    • https://s3.amazonaws.com/godewumazek/sirulurefiremineguxi.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_off0000efb8.bin
0910b7be4aba9e9e91e07ca56ee6ddce73e87fced79853d725eb7f474f2998b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 5192 bytes
font_01_sfnt_off0001013c.bin
2be22f8158d45a5922ce09b2807032f85ece2eeb01fb9a45bce30a8ec1475e25
pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 11108 bytes