Malicious PDF — malware analysis report

Static analysis result for SHA-256 5908a17846316ecc…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 23:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9aacbc60e75fb3187d1af6794a6084f5 SHA-1: 07d4ed620abb42984015cafc31bd3ecaea1a28d6 SHA-256: 5908a17846316ecc51a1bb8d73429ee21ac0c6740ded080878cbf779b405f4f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for further exploitation.

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://pistant.ru/uplcv?utm_term=willoughby+kangaroo+island PDF link annotation
    • http://fsgpj.com/upfolder/e/files/20210908102600.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/64388baf9a37944bd72e49f3d8266d83/211414608.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/kirifuwuputoxuwupuviroxob.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/r5k7gkdgc07p65v01h6dc2b9a1/zekokipix.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/sirapivuka.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/vawazukusotowixerej.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/22310728077.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/burebatafonadomisatu.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///remele.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///10523857518.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/64723182209.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/75890660052.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/31102156486.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/24202197607.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021981228545562.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/maxarasus.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/56710672759.pdfIn PDF document text
    • http://sjhtractor.com/d/files/jokudiwup.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/kalazigexunuku.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/66058201992.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/xalefiguzejesapulolapuvif.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/xavexukoni.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/5135454583.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/batuvezubaxuxe.pdfIn PDF document text
    • http://iltorg.ru/upload/file/gifudufixaru.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_off0000e1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 18924 bytes
SHA-256: 5a74b2d5117a20c089a14d2497dd03f7d923751049efee0435b4c1fad3f85af4
font_01_sfnt_off00011346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11346 10736 bytes
SHA-256: aad8a9ffb2a40892c8a98e999c3ffe26c2a734d54a00dc5abedfd68117fb248e
font_02_sfnt_off00012ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1