Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf04f3ecf0faf95…

MALICIOUS

PDF

73.3 KB Created: 2021-09-13 05:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5fc07edad3633921b4dd825044cf9dff SHA-1: 3882e5158bdc88eabbb63baa2369ecd5ad35ce8c SHA-256: abf04f3ecf0faf95c231c23d6aad7f0f247f70d245141e21d607f7d23814e9b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple unknown URLs, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://tasivn.com/upload/ck/files/jitaluxazoxavetemegekaxid.pdf In PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/balubut.pdfIn PDF document text
    • http://hidramaco.com/files/files/92496802782.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/94587699736.pdfIn PDF document text
    • http://checopharma.com/upload/files/99408222076.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/tuvutofuf.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/molukisumunepef.pdfIn PDF document text
    • http://tid.vn/upload/files/41540053099.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/98908588551.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/50309679246.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/benelepadifuvojidul.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/fasitulukagurebeluno.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/8133482916.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/59019114157.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/66420159369.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/woxajasixinetogutuji.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/leviduresevejowubosek.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-06-10-11-43-33.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/vumekafubupuzazevudakis.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/rizoninivoporibo.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/lizedab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=angry+birds+friends+apk+modPDF 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_off0000bc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2D 16392 bytes
SHA-256: 369e243620f220b6f575915e729fee903040ee1e7f310fbbf8379f70f74d98a0
font_01_sfnt_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 11024 bytes
SHA-256: f2748c66497e32093e66ab0ad1b705002aa325dbc3a825f61f796a86f8b8c925

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