Malicious PDF — malware analysis report

Static analysis result for SHA-256 555798021267c9cd…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 12:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3488529e54d5a75753b896c032fb231 SHA-1: 694ebb85e997b6cf07b2de18ff4fd6f078c152f4 SHA-256: 555798021267c9cd2778cf3a5ab866f689d1d5c3c5401b71904a260b108d2142
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially malicious sites. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution lure, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=rising+star+apk PDF link annotation
    • https://aradmissions.com/ci/userfiles/files/xibiz.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/70864044227.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404067ec8a2---gofigozepizikixa.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/worixavigapogisokugode.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/25074040916.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/taninoxi.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/totiwewetozeropu.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/joxudifoz.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/pizokol.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/wirigetonoroj.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/35531968542.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/68752489849.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/95928495262.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/52286059628.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/80111981508.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/58232746577.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/99262195222.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_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 18792 bytes
SHA-256: c48535c606531cfaa3c9cbffa4d2afb96a5eafc1a753ba9ff3e08f787981633a
font_01_sfnt_off00010aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12316 10268 bytes
SHA-256: 7085e3c138440ffaf710a146238ff15bfd05e1b1a007c3dbb8dd5fae3105d68d

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