Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2cbb24fba62547…

MALICIOUS

PDF

70.0 KB Created: 2021-06-14 13:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 232ff9a97d5317cb3a39f3f9fe5b08a9 SHA-1: 0572257cf0ad8dd9e49c471e9248198a86895b64 SHA-256: ef2cbb24fba62547a4cca1399c65eae9da02a385820d2609300ae1388305ef96
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary URL, https://crewmak.ru/pbw?utm_term=reinstate+alabama+license+online, is likely part of a lure to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/pbw?utm_term=reinstate+alabama+license+online PDF link annotation
    • https://berekimitavogi.weebly.com/uploads/1/3/1/4/131452750/vowalusofulega.pdfIn PDF document text
    • https://disamaro.weebly.com/uploads/1/3/4/6/134697064/1496113.pdfIn PDF document text
    • https://fogakorix.weebly.com/uploads/1/3/3/9/133997140/614c7.pdfIn PDF document text
    • https://fanuxerejupu.weebly.com/uploads/1/3/1/3/131398214/05c2c.pdfIn PDF document text
    • https://fatatarulawug.weebly.com/uploads/1/3/4/4/134474158/vepafoxajuka_badebasabo_jelegevadatikib_futiwodi.pdfIn PDF document text
    • https://merotulup.weebly.com/uploads/1/3/4/0/134000288/risufepe.pdfIn PDF document text
    • https://sozatugija.weebly.com/uploads/1/3/4/8/134859818/f9220.pdfIn PDF document text
    • https://kixuwoxidotajit.weebly.com/uploads/1/3/4/3/134351941/nexivon.pdfIn PDF document text
    • https://gavizixuf.weebly.com/uploads/1/3/5/3/135334805/7689165.pdfIn PDF document text
    • https://juwimifabofif.weebly.com/uploads/1/3/4/3/134369341/0817f2.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/xugevasozox-fotizikoda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sukagafamo.pbworks.com/w/file/fetch/144934611/56716555260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d376a930-bcc1-4f6a-8cd9-575e6336a8f3/how_to_use_heavenly_chips_in_cookie_clicker.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/w/file/fetch/144651567/exercice_singulier_pluriel_ce1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d536604e-a57c-4579-b8c0-f173d763535c/vetebenukegelami.pdfIn PDF document text
    • http://nalujoxerisi.pbworks.com/w/file/fetch/144662322/jtag_xbox_360_slim_usb_without_opening.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144689433/pusidowiwojanuzub.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/w/file/fetch/144681501/how_to_keep_a_conversation_going_with_a_sugar_daddy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5de0ffa-b021-4767-a2fb-15064ded4966/will_i_lose_weight_drinking_shakeology.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_off0000d1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E7 4996 bytes
SHA-256: 61c0a7460169ce48b7173ddc95b078ae42481fd60e354534b8f8dd9e4efc58b8
font_01_sfnt_off0000e2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DB 12164 bytes
SHA-256: a57f45b27e02cfe531af8562e3f6446175e3ffb1f94c754ec6275ac3ef5dafaf