Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a46694a69616588…

MALICIOUS

PDF

84.2 KB Created: 2021-09-11 16:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2f9e00598a90b67ea8e7a38e8795b5d8 SHA-1: 2a96e772e88083e1acc5c0261d8f9e6119df99a0 SHA-256: 4a46694a6961658896cc5de2b8621a413c66815b81688b30bef4029f879a90b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leveraging client-side vulnerabilities or social engineering to redirect users to malicious sites.

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://pixomot.ru/uplcv?utm_term=stomach+ache+middle+part PDF link annotation
    • http://totoquynhhuong.com/upload/files/8718741949.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/26925944297.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/zexoxuruwazokufizo.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/vijopivopedonogufetubizex.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/38494149196.pdfIn PDF document text
    • http://anm-av.de/uploads/files/fufufopaze.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/mifesusegojodarofalevut.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130d53ecc906---69872211524.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/01469a30d72b61392b507061bdb8e217/6204238856.pdfIn PDF document text
    • https://mihalex.by/files/files/xofarefozofewu.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/nixiz.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/74587165797.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210909_9AEAD08E653BB933.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/modenamadobineravazaw.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/wemevofesidox.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/tosurineluzimo.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/vesedotedusok.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/sisunovasemavapowojofuvad.pdfIn PDF document text
    • http://arsvet.ru/img/upload/57187438100.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/nawuparasazuzid.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/2979350318.pdfIn PDF document text
    • https://diphong.com/uploads/42472300457.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/zezuresexeki.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/78282250053.pdfIn PDF document text
    • http://elpijisystem.com/file/bakuwuxotirerawibi.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_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 10580 bytes
SHA-256: 1e5e6ee1816a948b160ec192c1cc90924fd7955f4b957c9044fdc6ac9e97dc2c
font_01_sfnt_off00010016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10016 16652 bytes
SHA-256: 5ff0d42735916bf7e04e2b9436753e90b11fee6a1f3cc608b46c6e6717979e25
font_02_sfnt_off00012b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1