Malicious PDF — malware analysis report

Static analysis result for SHA-256 6257bfd654d0b66c…

MALICIOUS

PDF

82.2 KB Created: 2021-04-16 19:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d32be4f0289a67e19ce9c160306e798d SHA-1: 5758c97f9e5e8c53f56a71667e8d4b29b4e1b477 SHA-256: 6257bfd654d0b66c95400f33a4f293730e45a4745f31d4c2ce34de41127e5bd0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crophysi.ru/strik?utm_term=stihl+ms+310+chainsaw+parts+manual PDF link annotation
    • https://cdn.sqhk.co/mudaxomemut/3iaXh9m/small_business_rules_and_regulations_for_employees.pdfIn PDF document text
    • https://cdn.sqhk.co/xijogedobu/hjZmabH/spin_warriors_istanbul_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/WUn8F3f/wwe_battlegrounds_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/bulelovuroga/RHjf6he/unity3d_vector2_cross.pdfIn PDF document text
    • https://cdn.sqhk.co/pubisifibuj/V3tidgi/among_us_all_skins_apk_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/ji9sUja/picosecond_laser_pen_red_vs_blue.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/ijjdiak/celtic_news_now_janefield_street.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvopone/khdjcKt/word_search_creator_free_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/hehbArv/95500759693.pdfIn PDF document text
    • https://cdn.sqhk.co/liritefebat/fD11Dia/fuzewiwogowulufekipowosu.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/jwMJiik/xavav.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/jXcIhcd/lagabanuvomo.pdfIn PDF document text
    • https://cdn.sqhk.co/zokirafuka/dhdRiaS/keladanazejibinavim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e486e0dc-e080-408f-a094-9b13ebe3c0f3/49386628343.pdfIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_320df2b15f0c421c958c29359fcf2101.pdf?index=trueIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_61421263f68b4039a06cdd1549261614.pdf?index=trueIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_52544a5c521f450fa5f4e8121f76334f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86e50949-dc5a-450d-a924-22c1b597545e/paintball_supply_shop_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17cd0906-9a43-43f6-8617-71389b1fed97/65868555216.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/why_will_my_nook_not_connect_to_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25593722-dcc9-4fd3-bd60-9bd29a3eaaa4/logitech_z-5500_subwoofer_stand_alone.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_cacb71e753e4471089f9e7b8da7ec722.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/784d7dc1-2aa1-4ded-82a4-b2f9f8e23299/grammar_for_middle_school_a_sentence-composing_approach.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/42789404075.pdfIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_552012fad8ee41d288170a4dc2ce5bf6.pdf?index=trueIn 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_off0000fe4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 5728 bytes
SHA-256: a880f58bdffefd820efaa236990472982751863c858eac89e524189c25117c27
font_01_sfnt_off000111b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B5 12112 bytes
SHA-256: aace0c683841bf2de06227163272da56a03484c21ab59c560435ef2479539737