Malicious PDF — malware analysis report

Static analysis result for SHA-256 715df876acb0618b…

MALICIOUS

PDF

79.0 KB Created: 2021-06-12 23:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9686c902bafa6a5921bde5d791842480 SHA-1: 491e857d3712646f1005c5f4bffe31a5a69e796c SHA-256: 715df876acb0618b544f118daedd44a7473062ec53fb36cb6c5d86caaf03e90c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nomylo.ru/pbw?utm_term=color+atlas+and+text+of+histology+pdf PDF link annotation
    • https://velazidolis.weebly.com/uploads/1/3/0/9/130969689/lekupafoxoxoxo.pdfIn PDF document text
    • https://bokonipazesokut.weebly.com/uploads/1/3/1/3/131398478/gidulufexewumori.pdfIn PDF document text
    • https://wagemerefav.weebly.com/uploads/1/3/2/7/132712282/22f03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tinigogazos.pbworks.com/f/zudizogagibowulubijo.pdfIn PDF document text
    • http://mokakiw.pbworks.com/f/fijewisisufoluxopipik.pdfIn PDF document text
    • http://zekapotog.pbworks.com/f/fowokus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a51e3c0-9b23-4170-b077-9743d32fdd63/23182088291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73c548cb-1957-4930-9ef6-f6afe137190d/ipad_mini_5_price_in_india_amazon.pdfIn PDF document text
    • http://fajopab.pbworks.com/f/56439335706.pdfIn PDF document text
    • http://doxawadar.pbworks.com/f/gerund_participle_and_infinitive_phrases_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30253eb6-e7a6-433e-a16b-1d67f546f8de/hkey_local_machine_software_policies_microsoft_windows_nt_terminal_services_fpromptforpassword.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3cef778-ac67-4744-840d-38638a23d480/polaroid_izone_300_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f09334-a620-4e7c-848d-506fd04555d9/shaolin_soccer_english_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c4fa07f-c9c3-43c0-b958-dd8901fc23fa/nupipagoz.pdfIn PDF document text
    • http://lodedeti.pbworks.com/w/file/fetch/144939048/xelemodakokunoziv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4213f111-b2e3-4608-960f-1952017b5ab4/gta_san_andreas_polis_olmak_hilesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec75ef8-4bb2-444d-84ef-874cc005e5f6/69492435702.pdfIn PDF document text
    • http://molitutolu.pbworks.com/f/xifedito.pdfIn PDF document text
    • http://jojekepodef.pbworks.com/w/file/fetch/144994941/nawonuxemegatavejapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f2341c-ca4e-4359-aec3-b14614a8f96e/calendario_escolar_2020_primaria_mendoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b0cb32-e9d9-4906-9016-f492eabc12f6/guforazemamog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f2156b-7c70-48f3-aa85-98baa6eb016f/most_common_phrasal_verbs_and_their_meanings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b885a1-ece5-4775-b8cc-c8ab4e068a0c/96624776752.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_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 5380 bytes
SHA-256: 8b37b924494c43bcddadf22b3371cb1ad436e25ce059e3bad76fcb23359d435f
font_01_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 11588 bytes
SHA-256: 6842e0c7c8827d38de8bb66f40b95da18782280f238cc48394ed79e8398dd7f1

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