Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c98f9bcc3dd398…

MALICIOUS

PDF

70.6 KB Created: 2020-12-23 17:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc8178dd69018d5899bb88ef4241ad60 SHA-1: 5a030c589f4abe7c5ce746ffeda6ef32732608d8 SHA-256: d3c98f9bcc3dd39891c0862b0418b2aceb47812f864ee5b897c3252823a59333
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external PDF links suggests a link farm or redirection strategy to obscure the final malicious destination.

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://cctraff.ru/123?utm_term=total+resistance+pdf
    • https://cdn-cms.f-static.net/uploads/4392864/normal_5f90d0cd000f0.pdf
    • https://cdn-cms.f-static.net/uploads/4383801/normal_5f9d6a0a82d36.pdf
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/jegomip.pdf
    • https://cdn-cms.f-static.net/uploads/4453108/normal_5fbeca1ed15b1.pdf
    • https://cdn-cms.f-static.net/uploads/4374196/normal_5f9066a5bf4de.pdf
    • https://cdn-cms.f-static.net/uploads/4493602/normal_5fb72d1c444cc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6aa16e6e-f9a9-46e0-9011-c1238077c3bf/cortana_apk_download_for_android.pdf
    • https://s3.amazonaws.com/niporofez/getudifigodur.pdf
    • https://s3.amazonaws.com/lewuli/lagu_kisah_cinta_kita_hafiz_shuib.pdf
    • https://s3.amazonaws.com/nonabafat/19207565018.pdf
    • https://s3.amazonaws.com/bisapovepizaj/55640363612.pdf
    • https://uploads.strikinglycdn.com/files/fd9bfad5-594f-4e8e-b98a-bf09ea360351/32537744174.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_off0000d88f.bin
8ff5ebdf7b9c178b5ec93ed501ee6688f105d6c510fea88afda3830b88db4e0f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD88F 5100 bytes
font_01_sfnt_off0000e9f6.bin
a9089e0db00b1fde7935851e834f3853f9f29845293571fa9270e2fd1cfcbb93
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 10564 bytes