Malicious PDF — malware analysis report

Static analysis result for SHA-256 9acee1a1e247dacd…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 04:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e363b6338970ab26f090a765998314c9 SHA-1: 3173ab1497181f0d494914d02a5dfef7898781f1 SHA-256: 9acee1a1e247dacd837c29850d94531e06b453792ffaedb5edec5ac9281e33d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded URLs strongly indicate a phishing or malware distribution campaign.

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 http://tnslib.tools/userfiles/files/79562554200.pdf In PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/a1f419755c676590bfd2ba06bcc3a0ee/vuvizobakisaxiwas.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/xaxubajilamew.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/bonuzop.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210910_509DF90F5929399F.pdfIn PDF document text
    • https://webmenuplus.com/images/file/59271510135.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/66903915791.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nebogegilidutok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237a319953---venenulab.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/81600027349.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/3779853161371bedee2bd.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/xawufix.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/linemolufapukofotejoxaneb.pdfIn PDF document text
    • https://egf.tw/test2/images/file/264074754.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/58896735422.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/morezotibi.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/vadiwemigoniji.pdfIn PDF document text
    • https://argumentua.com/i/file/81059049352.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210907203202012.pdfIn PDF document text
    • https://htchninc.com/d/files/96177940102.pdfIn PDF document text
    • https://profesa.net/userFilesfile/97372453044.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/xalofuxikidebu.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/21659810749.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/manizomumofakirurose.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210902005807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+change+pattern+lock+on+android+if+forgottenPDF 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_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 10900 bytes
SHA-256: 21b7b13d7620f96ea87bdf32d400698b165e4842d63fd759a0677e16eb031286
font_01_sfnt_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 17904 bytes
SHA-256: 2b033381cffef421128f00db9eb31b50da749e116cb3ea1f16dde56cd14bcecf
font_02_sfnt_off000123f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1