Malicious PDF — malware analysis report

Static analysis result for SHA-256 276804ee6ddda3e1…

MALICIOUS

PDF

70.7 KB Created: 2021-09-29 04:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b201e8fbd9f9573225212a4e5523a2d4 SHA-1: 02b7a0e6e0127365e4e062517a029e2d213d4f13 SHA-256: 276804ee6ddda3e1128439c305d1662f88a402c93bc53637066bc6108e5cedd0
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with a high-confidence heuristic identifying a link to an algorithmically-generated URL. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, but the presence of numerous links suggests a link farm or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://apvn.info/userfiles/file/3866794452.pdf In PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/81249413305.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/1476396069.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/wulamo.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/maruvomorama.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/814fb6cb2e3cc2dac157500bc4ed4310/bovegerelafuloxarorewa.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/jiwoto.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/60702785056.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/jaroweza.pdfIn PDF document text
    • http://newworldss.com/uploads/file/nafasowojowisi.pdfIn PDF document text
    • http://dasbluemchen.com/fimulupuzikumupu.pdfIn PDF document text
    • http://showpelec.com/data/file/20210904_114903_149.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/wanosiwatofixogunisazowi.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/5584216109.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/javinu.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/rupijirerawidulepetavu.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/dilorazitam.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/98896840453.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/nivazo.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/57354604861378c55e75ba.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/kezikula.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210907084438275.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631178199.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/60698562408.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/55745778396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=rooter+hack+modPDF 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_off0000b152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB152 10360 bytes
SHA-256: 43411c006c58551ab68398b94641fb7e78aa6bd28731b314427ca7453a9063cd
font_01_sfnt_off0000c8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 17540 bytes
SHA-256: 48725d489b18158986bc3110245104f0740f78bc953a6de9cfd3926d80ddb847