Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b3dc0825920020…

MALICIOUS

PDF

82.1 KB Created: 2021-06-01 09:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d2fd04f8568c36443c1d8fcede33ec47 SHA-1: 4aa6243e5b357d1f2afbf5c25d3795b56356ab80 SHA-256: 25b3dc082592002054bd92cbecf6fc1111125699d36de543f07cbdee45ef6fb3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spamming operation. The primary URL, https://coretry.ru/pbw?utm_term=how+to+drain+water+from+keurig+k50, suggests a lure to disguise the malicious intent. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/pbw?utm_term=how+to+drain+water+from+keurig+k50 PDF link annotation
    • https://zutumageru.weebly.com/uploads/1/3/0/7/130739253/sidotavuw_kogaje_bomeda.pdfIn PDF document text
    • https://fowedejuman.weebly.com/uploads/1/3/4/5/134518602/jagavuz.pdfIn PDF document text
    • https://rawudirujitasep.weebly.com/uploads/1/3/4/5/134588445/nizotamif.pdfIn PDF document text
    • https://mudujisobugabe.weebly.com/uploads/1/3/4/5/134511382/3b8df42793c4395.pdfIn PDF document text
    • https://vajawopi.weebly.com/uploads/1/3/4/5/134597817/eef155bf2.pdfIn PDF document text
    • https://sofotegepure.weebly.com/uploads/1/3/4/5/134522016/zatusutu-lagoramup-vobalevax-sitesol.pdfIn PDF document text
    • https://pimesawugure.weebly.com/uploads/1/3/0/7/130776266/8916837.pdfIn PDF document text
    • https://bixemasabomevis.weebly.com/uploads/1/3/4/5/134517571/a05c27918a.pdfIn PDF document text
    • https://fivujage.weebly.com/uploads/1/3/4/3/134316273/1574451.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dijakezepo.pbworks.com/f/fosodozeribitajivimela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d2cc8c6-3e74-40ce-9d01-3367a2aee0ca/14898782652.pdfIn PDF document text
    • http://mukonisu.pbworks.com/w/file/fetch/144446811/danzas_del_per_costa_sierra_y_selva.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/w/file/fetch/144441516/sutta_pitaka_in_hindi.pdfIn PDF document text
    • http://zeladejan.pbworks.com/f/tamil_movies_madras_rockers_free_download.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/73787370362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e2b004a-ba10-4954-a57a-a848e9742d62/how_to_use_logitech_mk320_keyboard.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/taylor_swift_google_drive_mp3.pdfIn PDF document text
    • http://japomajuxire.pbworks.com/w/file/fetch/144441669/70995915119.pdfIn PDF document text
    • http://lipadune.pbworks.com/w/file/fetch/144427176/catcher_in_the_rye_important_quotes_with_page_numbers.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/f/644650506.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144417360/lenovo_google_account_bypass_apk_download.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/zepujunituzufosefa.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_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 5400 bytes
SHA-256: 9ee0667986c605b713f93b05f422daca72812dee3a746891e8e9b43f125f8c59
font_01_sfnt_off000114bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BB 10840 bytes
SHA-256: a931d39bef19110e2388c75993a81af706fa5b0bdb4fe0b20c85129078e8e90f