Malicious PDF — malware analysis report

Static analysis result for SHA-256 0deea625fae7c659…

MALICIOUS

PDF

79.0 KB Created: 2021-02-19 22:25:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 86f42c6433ede1449a279b49552f2049 SHA-1: 77fa48fd408a588dc0a54bda71f3eeb2b1dbd6f8 SHA-256: 0deea625fae7c659f4dad9d9e4c2f7a95c225b8f857943ebd6c8ed238bdf53e1
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or known redirectors, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL `https://yafferge.ru/strik?utm_term=surface+area+formula+for+rectangular+prism` is a critical indicator of this malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=surface+area+formula+for+rectangular+prism In PDF document text
    • https://gejowarog.weebly.com/uploads/1/3/2/7/132740172/boninimemu.pdfIn PDF document text
    • https://cdn.sqhk.co/xigofidiw/ZSZgfs9/emergency_dentist_24_7.pdfIn PDF document text
    • http://kedusigodozop.22web.org/medicare_guidelines_for_insulin_pump_supplies.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/UNvwewQ/pacsun_cyber_monday_promo_code.pdfIn PDF document text
    • https://tipureroxagojox.weebly.com/uploads/1/3/6/0/136096040/9801520.pdfIn PDF document text
    • https://posesisex.weebly.com/uploads/1/3/5/3/135332701/winonona.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/jcRaL9N/free_business_accounting_classes.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/dbhejbU/bijoxuvulonipazerijozozu.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/gjmNjiO/color_replacement_tool_photoshop_cs6.pdfIn PDF document text
    • https://kipunelikerave.weebly.com/uploads/1/3/0/9/130969086/diwixu.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/putelekireza/lepadajabagudaxige.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/what_is_a_pathology_report_breast_cancer.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/chasing_cars_spanish_version.pdfIn PDF document text
    • http://melamepapate.rf.gd/android_developer_settings_shortcut.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/gulenomapuregedut.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 5436 bytes
SHA-256: a75818eff2ac74744803aa2e0bd50a02b7c7d936b1cd49ded3afbda268a59303
font_01_sfnt_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 10608 bytes
SHA-256: 13fe1750e6d86eca2dd570a0db1dd1eff433fe872edf4b4ed03844fb9ebee29c
font_02_sfnt_off0001176d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176D 16808 bytes
SHA-256: 832b65e3839e5e4dac2b521176db1e469009e7a6e7fa1ce9c2cb15d72b0d3c09

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