Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2c4c922e5bd111…

MALICIOUS

PDF

137.5 KB Created: 2021-03-01 08:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c77a0636d153986611cb5e29a1450bae SHA-1: 72b5c66f604c8438f1c4c081db558d7a18aef150 SHA-256: 7a2c4c922e5bd111eeeeb3f4e76a7438c19f45ac2e3e32ed8ac9dabd8ad4da42
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/strik?utm_term=singer+futura+error+codes PDF link annotation
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/7050688.pdfIn PDF document text
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/rabudolekagixogaf.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/1939c3.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/xudesubuvupazagef.pdfIn PDF document text
    • https://kesiwupi.weebly.com/uploads/1/3/1/4/131407351/vefukuni_vopusetipefoku.pdfIn PDF document text
    • http://setovewurepenu.22web.org/nadito.pdfIn PDF document text
    • http://rojoguladewex.iblogger.org/fisher_price_baby_swing_set_swing.pdfIn PDF document text
    • http://suxinojopamur.iblogger.org/emerson_19_inch_smart_tv.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/dell_precision_m4700_webcam_driver.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/how_great_thou_art_free_printable_lyrics.pdfIn PDF document text
    • http://giwitap.getenjoyment.net/haitian_declaration_of_independence.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/virijitomef.pdfIn PDF document text
    • https://wezawemexa.weebly.com/uploads/1/3/1/4/131410399/879351.pdfIn PDF document text
    • https://zomoxiwoginu.weebly.com/uploads/1/3/1/6/131637743/7019709.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/77249269192.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/44616642177.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/xetasif/levetiracetam_davis.pdfIn PDF document text
    • http://punolubumima.epizy.com/kilazof.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/46055368526.pdfIn PDF document text
    • http://gobavaduxa.epizy.com/between_the_sheets_book.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_off0001dab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAB5 5260 bytes
SHA-256: 83972990c9cde5f4143a1b22d73a6c42cbc61b0cc471f8efe720bc852ba9d444
font_01_sfnt_off0001eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ECA3 13560 bytes
SHA-256: 04b7e8190bc134c12e47528fdc6d4600a8cf79589763793df2f6a1eb235869e8

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