Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c69849c0c21fd7…

MALICIOUS

PDF

69.2 KB Created: 2021-02-17 01:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 810d7f622dd762c34c8ceeb6c5726a22 SHA-1: 4f6cf5e7afe82bf282fcb71651707f389621963a SHA-256: 48c69849c0c21fd7dd216706148ebbc001ea07c040900c9218058b24f1775590
214 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains or link farms, indicating a phishing or spamming operation. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'crophysi.ru' as malicious redirector infrastructure. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/strik?utm_term=cabela%2527s+pro+series+meat+grinder+attachments In PDF document text
    • https://boviseweduxiraz.weebly.com/uploads/1/3/0/7/130776594/sodobokemefibe.pdfIn PDF document text
    • https://kikuwigew.weebly.com/uploads/1/3/1/4/131407235/fononowasuji.pdfIn PDF document text
    • https://najabokaxosol.weebly.com/uploads/1/3/5/3/135300306/3fbe04acb.pdfIn PDF document text
    • https://boxenisudima.weebly.com/uploads/1/3/2/7/132740338/9e02ebd3da89f8.pdfIn PDF document text
    • https://cdn.sqhk.co/jifegusewe/ckgfyhd/52557257300.pdfIn PDF document text
    • https://noserosajegupa.weebly.com/uploads/1/3/1/4/131453720/wuwegizovemedib.pdfIn PDF document text
    • https://nuxofenaf.weebly.com/uploads/1/3/5/3/135306259/vogatalidaberoma.pdfIn PDF document text
    • https://bobusenig.weebly.com/uploads/1/3/4/8/134866704/3851558.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/Uidzihg/70800564240.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/feluxamafeke.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/gezizefefififa/anandam_telugu_movie_mp4.pdfIn PDF document text
    • http://takugiwem.rf.gd/bootable_iso_maker_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/zolewetiz.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/gagilawatupuvusafi.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/52859020143.pdfIn PDF document text
    • http://jidoxib.rf.gd/zofif.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/colors_tv_hd.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03C 5564 bytes
SHA-256: 0b681737f89cd3a8e958beda4f4997e53acb84a1f47cb0841317648d79f1f99a
font_01_sfnt_off0000e2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F7 10788 bytes
SHA-256: e67cf71de908264e89ec4474989b4511906c408ba51f601f718458658e0e9116

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