Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b8515c5c358452…

MALICIOUS

PDF

79.9 KB Created: 2021-02-26 23:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5267ff184ae0377327c7f4f7c6582368 SHA-1: dd04551329597df948deca391bc3029bd36d97e6 SHA-256: 15b8515c5c35845213e61d7348ec3c50335be3763f51907386895e3299cd4a2e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' and the presence of many URLs suggest this document is part of a larger effort to drive traffic to malicious sites. While no scripts were explicitly extracted, the PDF structure and the ML classifier's high confidence indicate malicious intent, likely related to redirecting users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=hampton+bay+air+conditioner+model+hbq080-f+manual
    • https://cdn.sqhk.co/xafukapewe/0pjahiX/81461643847.pdf
    • https://fefedajukuda.weebly.com/uploads/1/3/1/0/131070841/9183593.pdf
    • https://cdn.sqhk.co/xelajuwodaf/hhjhG3M/rebuilding_exchange_evanston.pdf
    • http://zoxejusozowevo.iblogger.org/bezujigipopatux.pdf
    • https://lefusavuforuv.weebly.com/uploads/1/3/4/4/134490278/5546831.pdf
    • https://cdn.sqhk.co/moromasi/ggge4bq/nupukirarewutofixudeta.pdf
    • http://liwitavazij.iblogger.org/64204058150.pdf
    • https://vujivizu.weebly.com/uploads/1/3/5/3/135305207/8093555.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://beguresenoraw.epizy.com/betajomotex.pdf
    • https://s3.amazonaws.com/wezukep/teamviewer_13_for_windows_xp.pdf
    • https://s3.amazonaws.com/voxulija/86404165530.pdf
    • https://s3.amazonaws.com/pazerogasarinu/xilonojixalarorogojajawob.pdf
    • https://s3.amazonaws.com/jefobexapulow/48262619959.pdf
    • http://minapisifiret.rf.gd/zixonewakazudukenubalifaz.pdf
    • https://s3.amazonaws.com/bezorito/1534258489.pdf
    • http://xujalupa.epizy.com/free_able_resume_templates_for_wordpad.pdf
    • https://s3.amazonaws.com/kikunojulejuj/zulomosadaluve.pdf
    • http://xafejebefejo.epizy.com/chicago_fire_episode_guide_season_2.pdf
    • https://s3.amazonaws.com/wixamupelinere/25223606970.pdf
    • http://dodozos.epizy.com/xuvigonodul.pdf
    • http://weloridotam.epizy.com/92439189123.pdf
    • http://feduvilez.rf.gd/dituwe.pdf
    • https://s3.amazonaws.com/dowesitobuga/letter_format_for_purchase_order.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f999.bin
1b966d55c24dd712917abf8e035da6d40b9b99699bbf7df9590ab3335c375fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 5912 bytes
font_01_sfnt_off00010d93.bin
2d34515c12dc52ba5a2b15d83edd071a1fce1085e403c14401b578ec34c6c58d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D93 10652 bytes

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