Malicious PDF — malware analysis report

Static analysis result for SHA-256 acee59633123f278…

MALICIOUS

PDF

77.9 KB Created: 2021-03-15 17:51:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 137a8e25f319d527e968aa4593c3d7a1 SHA-1: b7dcb7798125d7d92b3417f9657387103dd55be7 SHA-256: acee59633123f278868c5d6259584a70eec8a4a9f109d6088ac18d07901e62f5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. While no scripts were directly extracted, the nature of the link farm suggests it could be used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/wix?keyword=life+cycle+of+barred+owl PDF link annotation
    • https://vawevoza.weebly.com/uploads/1/3/1/4/131482963/sarafus_rewesalu.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/cwijV7t/romance_fate_stories_and_choices.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392441/normal_604e0ff5cf024.pdfIn PDF document text
    • https://wejigewaja.weebly.com/uploads/1/3/5/4/135400860/jiposojubuve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454162/normal_5fff994e00faa.pdfIn PDF document text
    • https://buritozube.weebly.com/uploads/1/3/0/7/130775753/310f726aee.pdfIn PDF document text
    • http://magonimiw.iblogger.org/65593972246.pdfIn PDF document text
    • https://cdn.sqhk.co/salulilo/760vjdB/top_rated_high_graphics_android_games.pdfIn PDF document text
    • https://kazajibabagak.weebly.com/uploads/1/3/4/4/134467412/8989343.pdfIn PDF document text
    • https://binapesod.weebly.com/uploads/1/3/1/4/131438069/7503465.pdfIn PDF document text
    • https://fipogelijemebu.weebly.com/uploads/1/3/1/3/131398193/299407.pdfIn PDF document text
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/lazogiperezud-zexifebokola-navop-ruvejuxekexowu.pdfIn PDF document text
    • https://cdn.sqhk.co/bevurokakug/iediiiC/mommy_twins_baby_kitty_hairdresser_beauty_salon.pdfIn PDF document text
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/2c8dc2248f.pdfIn PDF document text
    • https://lofuniwap.weebly.com/uploads/1/3/0/8/130874201/xovim-loluxitubumare-keniduma-wokizomoluditu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_6020617baf473.pdfIn PDF document text
    • https://cdn.sqhk.co/fagiseregu/jhjgijl/assassin_s_creed_unity_costume_locations.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409425/normal_604cf1f053860.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_3eb66d5d72804a20b8e0baa649297ec2.pdf?index=trueIn PDF document text
    • http://vobujilub.epizy.com/18610224350.pdfIn PDF document text
    • http://bojonovaja.rf.gd/netuli.pdfIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_71f7495bbe1b4ab19a0b33b2ef8446cc.pdf?index=trueIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_32ac4583b0a54bbda5bdc7099c8b5bfe.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_fa819db21976442b956f15ce693d7a31.pdf?index=trueIn PDF document text
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_4a27355af04c4bd8bac4b2fdacfb1fb7.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 5112 bytes
SHA-256: d2bf650e40cb0799bd31aae16e9a24e71f415302d260eaa4b7eb541f16cc92ba
font_01_sfnt_off00010673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 10456 bytes
SHA-256: 5f3e5726912216d3dbd6e4e62d9feb17f9388049089a2f6a628af9df3461d0f9