Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ccf61e7efac695…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 21:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aaac497f493781c8c4e5cb813be5b928 SHA-1: a1e464d2a1cafa76c68dfd8bb8897bb7b10dd565 SHA-256: d4ccf61e7efac6956ff9febb4ab664865a2e99aee0139df48a22566e7df76444
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of multiple external URIs and the link farm heuristic strongly suggest the intent is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=malayalam+onam+songs+mp3+free+download PDF link annotation
    • https://artgallery.devctn.com/ckfinder/userfiles/files/gavozodijasowubegexarel.pdfIn PDF document text
    • http://status.cz/UserFiles/File/folawodamoforu.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/21635976589.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/36595451289.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/14934756832.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///73033960634.pdfIn PDF document text
    • https://33mobility.net/uploads/files/23323191219.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/kavesaxekixodexikagonupaz.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/japusejowimeronufivowef.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/88243089189.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/kasabixegagiwosokujo.pdfIn PDF document text
    • http://shopabrang.com/images/files/nevixaxixolur.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109111734357273.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2c40921c09b10160e644fb4cf671554c/mitavir.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/16709287301.pdfIn PDF document text
    • http://gzmingjun.com/uploadfile/files/20210907_134429.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/77585035496.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/zilupezowiji.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a806f42df2---16151300940.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/duxemik.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/nifoxaboziriwudezafu.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20066766532.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/zadaja.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_off0000c2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E0 18852 bytes
SHA-256: 2ace11099e77082703b3a13c9e2cf00b838e19228126da5fc6eb963400a668d6
font_01_sfnt_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 11016 bytes
SHA-256: d076760a248529fc470137b1c57db74cfe6894fe9c132f2a3358168175bb61f1

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