Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b01c7980176a4b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 06:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 60a3852f15f634bbd3ae7d20e23d3ffc SHA-1: a6574b2764da442075365a1b07764c8115d35d99 SHA-256: a7b01c7980176a4b255636be43168ec661b7de4a0550efa825548538ae5c3c79
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://krisoc.ru/uplcv?utm_term=zapya+old+apk PDF link annotation
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/92191735385.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vawijizunekulajinozudaji.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/semoloruravifobuzi.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/fiwuro.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/2410673863.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/9734222158.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cbac31b32---tejirekan.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/metesomozivopanozolodoto.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/kifefemawifavove.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/wukomupisija.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/nibizamepekiga.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/49211716283.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/puwukobonuzeru.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/nuget.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/76030154208.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/gelubifaropalijovumed.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/66089541968.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/kuzigowiwugenosomijalaj.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/82256499832.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/1752944619.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/jexinekifejile.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/bobomojibixilus.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/23215300855.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/rivijenafobazujej.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/1c0c772922913e9ebadaccac80cf46af/pilufegu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 19308 bytes
SHA-256: 225d813e5d815b310487e64f8a6ef991d8613163fdcc287dec965043eb1d23b0
font_02_sfnt_off00011f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F61 9860 bytes
SHA-256: 52eefb7cb4638700ef0cc3393907b74789e1aef019b1cd6a2e18b84767ef9878

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