Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed853a6e063c0f1…

MALICIOUS

PDF

69.3 KB Created: 2021-02-16 21:05:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1d6fabe2328a30f994fa616372bbeef8 SHA-1: b6fc014f24b38cb349e02202a3b400b9410b7379 SHA-256: 8ed853a6e063c0f199097417e36c634e337be6ae2a9bc9f39b68664680cc264f
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to disposable hosting, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Tissot 1853 chronograph instructions', likely to trick users into visiting the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://yafferge.ru/strik?utm_term=tissot+1853+chronograph+instructions In PDF document text
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/luwodibewiwa.pdfIn PDF document text
    • https://cdn.sqhk.co/wadalibituge/gjigCjh/remedy_soap_for_eczema.pdfIn PDF document text
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/xegigozusoxupusita.pdfIn PDF document text
    • https://turugoduzo.weebly.com/uploads/1/3/0/7/130739986/jumilef.pdfIn PDF document text
    • https://xofeboje.weebly.com/uploads/1/3/4/5/134584890/fb8098f823c97.pdfIn PDF document text
    • https://sudopefizumizer.weebly.com/uploads/1/3/1/3/131383323/xapize-mafanunew-jeturedetapen-wopasixuwewafa.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/WNUmKib/smart_care_oximeter.pdfIn PDF document text
    • https://fezimadi.weebly.com/uploads/1/3/4/4/134487715/wewiro.pdfIn PDF document text
    • https://dudisavaw.weebly.com/uploads/1/3/1/3/131380109/2640106.pdfIn PDF document text
    • https://cdn.sqhk.co/nigulavax/jhgfhio/myblock_h_r_block_usa.pdfIn PDF document text
    • http://springital.fun/macmillan_gateway_b1_workbook_answers_unit_2x6ods.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/hangout_free_for_android_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/yii2_advanced_application_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FE 4000 bytes
SHA-256: b003eaa5779747570f94e2984bac7d6ba9c4a72331a53e8618b51b14d0514b6f
font_01_sfnt_off0000cebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBB 5644 bytes
SHA-256: 300396879c21b46c514ba02ec80263c6c9cd8066df76189133d97b0363f7ea41
font_02_sfnt_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 10612 bytes
SHA-256: 2a2911144cbfcc6352d2af43134edcf1a044bf40f0d562b34887902e847a9e57

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