Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f69348f714b816…

MALICIOUS

PDF

76.8 KB Created: 2021-06-10 02:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 804559dd78ba0d95711eb2506bc39f5c SHA-1: ce827fe975aded76f86d61c08ac91b2770c34b5a SHA-256: 31f69348f714b816557612fb2c7ef32263151dcd509bc61a10f419ea573fe30a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, possibly exploiting PDF vulnerabilities or using embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://laborke.ru/pbw?utm_term=traffic+rider+hack+version+unlimited+money PDF link annotation
    • https://mokomopepu.weebly.com/uploads/1/3/5/3/135333670/favuvubuz-xozegufamawom-nimon-kezusowan.pdfIn PDF document text
    • https://kapupigabila.weebly.com/uploads/1/3/4/7/134729593/8886373cc0d.pdfIn PDF document text
    • https://zideloxilatomi.weebly.com/uploads/1/3/5/3/135325243/2293605.pdfIn PDF document text
    • https://lepamatizetu.weebly.com/uploads/1/3/0/7/130739269/6b2f782759.pdfIn PDF document text
    • https://dakusarifupufa.weebly.com/uploads/1/3/3/9/133997242/jedoniz.pdfIn PDF document text
    • https://tubonizuruzoxuk.weebly.com/uploads/1/3/0/9/130969435/261b7833fed.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/pugajebopaza-vujolisa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bevosox.pbworks.com/f/dowizarituj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1535253-eb0a-4c46-8179-ffd36cb61a61/wawebejuzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d7ac07-5248-4840-abbb-c5ec5b01da05/vidupilorawenefuxuxupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/015b3729-0ae6-4328-9042-35f925bbffdc/85985318024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9991dd50-5766-41bc-adb8-1907c060b3c0/ib_visual_arts_hl_process_portfolio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe1894c-cae1-4e1d-8797-609be0e0eb1f/webomuxozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d41651b-a4be-4513-b359-ee82aef44ee9/how_to_calibrate_expert_grill_thermometer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b293bd-6c98-423d-bd65-e0d5bc775ab8/fovegesizanalogiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c153210-39d8-43f5-92ef-a1a9e4fff09f/the_secret_book_amazon.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/w/file/fetch/144617361/acs_study_guide_for_organic_chemistry.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/wosekemejimizegajipolalov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4dccde3-369d-43e8-8aac-c47388d041f9/how_to_scan_to_email_on_hp_officejet_pro_8600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcbd56d2-1ab1-4348-9fb0-e967801ada1b/instrument_used_to_measure_rainfall_is_called.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_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 5436 bytes
SHA-256: cca8243a0aefb2d362205b1aee9ad0a715a71782c4aa496f1ae51829d766bf32
font_01_sfnt_off0001008e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008E 10904 bytes
SHA-256: b93364fae740ed9045174730a0f99b185275c36bbb75fba7ec192c9b6176471d