Malicious PDF — malware analysis report

Static analysis result for SHA-256 4890800ced49c8d1…

MALICIOUS

PDF

78.3 KB Created: 2021-10-08 01:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 64bf3290607e14f3058171b7325c92e0 SHA-1: bd6cc73226cc315848588c062c0128613dea7516 SHA-256: 4890800ced49c8d1242dc71bb4ea0ce9ed019091340b2602fe02b8d5a06e4639
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious intent. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=pizza+pizza+pie+song PDF link annotation
    • http://taborgospelassembly.com/userfiles/file/gikavi.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/66877984826.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/19241200536.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/84303767779.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/rekoma.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/noduxowazatusa.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/58877355455.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/91297449060.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/lodafinupawigizimipojore.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/mipugawokidikarufinoxop.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/sigizafigolur.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/veremiliponuwo.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/34163185216.pdfIn PDF document text
    • http://grafittipng.com/userfiles/files/33127623242.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/zeduzodura.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/9371045164.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614747f792d8f---51001136063.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/pagasobawamefudusov.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/87342963654.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/kalat.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/94472996058.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/refumoridovupalawufopaje.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_off0000cd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD17 10244 bytes
SHA-256: ddda3b54844085761880babb9f314266068c541ec2257b024c0891da85421082
font_01_sfnt_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 18008 bytes
SHA-256: 4a82bab62479a784cb3ccf6a69b06d1dd0930bbffc1e9320b4c87b192cbb6f1c

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