Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c836a220dfaa75…

MALICIOUS

PDF

70.1 KB Created: 2021-09-18 06:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3948db3c30ed78b13a266f6150b538a3 SHA-1: 5ca99cca57cf18bdfadc9b0e7702a41a618c9d3d SHA-256: 41c836a220dfaa754c0b852a2b707b43e5bf3a54bcf9adb228599ed006f88cf3
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://pixomot.ru/uplcv?utm_term=battle+prime+free+download PDF link annotation
    • http://sprinter-lab.ru/content/File/53354129928.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/69522178833.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/99019679859.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/luxasugo.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/87222675881.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/buriwapapen.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/76013179974.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/17181411810.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109172154447428.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/35650620705.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/8575587231.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/gokusabilirikupalilawi.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/dadezimamijuj.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/90945048162.pdfIn PDF document text
    • https://dcimx.com/files/82883827096.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613655c607da2.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/3752344562.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/77512865218.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210901104515257586.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62965059352.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/af0d212e2aba2593bf3b815de9812797/juvimerawonanataw.pdfIn PDF document text
    • http://sayarbobinaj.com/file/gapar.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/dodigewedafubap.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/sudebezisajurepinoti.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://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_off0000b3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EC 10632 bytes
SHA-256: 2c2210b2ac31ecb064a5c290f1c514d066522af00493574679139ab2d9f1b886
font_01_sfnt_off0000cc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC46 15264 bytes
SHA-256: c472adc536913817350df380e95801ed7eeb1fe3c0a82d09e23a9ff49a916f13
font_02_sfnt_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1