Malicious PDF — malware analysis report

Static analysis result for SHA-256 b357d35949492929…

MALICIOUS

PDF

89.3 KB Created: 2021-09-20 12:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e793b44991ee840cb4d8fadcef10e0c SHA-1: 7510dbaebff53409e00212c54f92426a6b9334c5 SHA-256: b357d3594949292992a25aba7c13f561f63f28796fc644e6a6021a0939ae05fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it's intended to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://highfieldhousehotel.net/nbloom/fckuploads/file/tupuxorenaxanejelewipaja.pdf In PDF document text
    • http://hidropro.hu/upload/zonosamotipafijefikoso.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/70054368394.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448145b20e0---vevopadevexu.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630909081_1.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/651046755.pdfIn PDF document text
    • http://tdbm.vn/upload/files/87997120879.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161345d7262492---pavukufakoloxirisevuxoz.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/nunaruni.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/kebupuw.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/gokot.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/97834056090.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/92671475021.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/55833671245.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/23516646362.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/376986548.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/35731502509.pdfIn PDF document text
    • http://canvangdientu.com/images/file/ronifiguresa.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/62089965525.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/tafonirijajabesiv.pdfIn PDF document text
    • http://coumert.com/images/file/xegamofeguvodalurimefun.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/xitapafavijuf.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/20816176793.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109162157175311.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/riratipime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=online+play+moviePDF 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_off0000fa22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA22 10252 bytes
SHA-256: 32cca7b43dcd1491b7cd5ddb6e07e0199f19a997adcdbab9f6e0c096ff23ec95
font_01_sfnt_off0001111e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111E 18052 bytes
SHA-256: 8896ed4df7b7bbea0eb571c96e1ff020815169143404879dbe96702ec92e6c04
font_02_sfnt_off00013f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1