Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f5bb40831bdbd0…

MALICIOUS

PDF

72.3 KB Created: 2021-09-21 13:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dffe1bd336787edd0ba955ebf8677ff6 SHA-1: 7304c4c3a97eaf2f56bbfdf2f8d6e12096f53449 SHA-256: e6f5bb40831bdbd0bd38bb58f4960ca2be3721381eb61a2518f38244d6566e39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm designed to obscure its true malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 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://nilsahost.com/calisma2/files/uploads/bokemulek.pdf In PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/65536049234.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210912/files/20210912205632.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/72318344651.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/98214902921.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/pofelaxipefuwaxu.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/debifexaxezuvafufix.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/29971838088.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/nanuvofunodedimunelaboka.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219141115573834.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/digometolovozegadufonux.pdfIn PDF document text
    • https://pellevah.com/upload/files/74032469856.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/71738363277.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/38836827676.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/57062474522.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210907145809.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/28741847760.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/74462212736.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/75330657850.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/woriborelasel.pdfIn PDF document text
    • http://agilesolutions.in/uploads/8009579096.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/7crjdfougn9q82j0laqfp1te5t/85585159540.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/2667755502.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/mugololubafatijanila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=wandavision+live+wallpaperPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA93 16108 bytes
SHA-256: 9cd1501d94165acaefce37e801f749105f5cdae06dc59b31c9064e2906bd9516
font_01_sfnt_off0000e3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E6 10432 bytes
SHA-256: 2520c44713bea97f20df0ee0ff88b162df37e3fda303aeaf5c092f74ff14c405
font_02_sfnt_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1