Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5336266d2c4a7c3…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 16:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e67c2af8e86f7a23f8c370bd588d6cd9 SHA-1: 764d22d9dc455f194452e272fd6d6adb8899f5bc SHA-256: a5336266d2c4a7c3a4f4316e4543f11b171f7d928ff313b6a5fcff9643dcb3b0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm and a callback phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites or engage them in a fraudulent phone call. The presence of numerous unknown URLs points to a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://mastrodibaglio.it/userfiles/files/sesobixegijolupivoridege.pdf
    • http://emeraldcovepartners.com/_data/images/file/gibamotamasilarulepiv.pdf
    • https://bacsionline.net/userfiles/file/73244030943.pdf
    • http://poltinka.ru/userfiles/file/kexuruxafopax.pdf
    • http://dryoucosmeceutical.com/userfiles/files/kukeberezobozo.pdf
    • https://siroyensao.com/upload/files/zanagigolojinar.pdf
    • http://020tzs.com/baige/images/userfiles/file/fizitademajimokuxakipelin.pdf
    • http://faceconnects.com/ci/userfiles/files/wemog.pdf
    • http://studiocalderini.it/userfiles/files/bizimobutapusizetobape.pdf
    • http://nensi.si/upload/file/morizomodiwaka.pdf
    • https://birudongker.com/contents/files/genolelalijabesegul.pdf
    • http://rujiahk.com/uploadfiles/file/fepab.pdf
    • https://muacash.com/webroot/img/files/6012813136.pdf
    • http://nuraski.pl/wsg/userfiles/pitulukijor.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/nurokovupobedekusisam.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614007ba2c53a---sevitukedefatovadipegapa.pdf
    • http://www.vandiestbrandstoffen.be/uploads/files/latilafavagukijo.pdf
    • https://alsharqcc.com/userfiles/files/zijinozojomiwepaxinotex.pdf
    • http://fasson.vip/images/editor/files/62886740034.pdf
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/40236296633.pdf
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/70653724852.pdf
    • http://www.mediagrand.hu/data/editorfile/kuvutek.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+a+rooted+device+android+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aeb2.bin
2c62ddf4b7e0ebc731787662b6be4cbb89a0fa407dd630c882fc92c0f0b6d850		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB2 10624 bytes
font_01_sfnt_off0000c700.bin
fed97757ce1385537408fb96e508c078fd3d87971fff001d73696f3afebdf5fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC700 17396 bytes
font_02_sfnt_off0000f38e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.