Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb04ab6e85ee91e2…

MALICIOUS

PDF

74.1 KB Created: 2021-02-15 23:01:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 805297abed878287911ac2541880662b SHA-1: 5a5f1f60b14120fa6ea6d285c6e785ce47195c24 SHA-256: cb04ab6e85ee91e2e69865199a06017d012a4c6567290d1ae9674e1d073d41c8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a redirector to a malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or credential harvesting. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/strik?utm_term=what+does+a+boiler+technician+do PDF link annotation
    • http://dreabling.online/9844139345wkcgq.pdfIn PDF document text
    • https://motefeka.weebly.com/uploads/1/3/4/1/134108707/buzipaga-wanikonolul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405903/normal_5fee80c9d6d49.pdfIn PDF document text
    • http://zatorigixoluji.iblogger.org/algo_trading_basics.pdfIn PDF document text
    • http://fitoxis.22web.org/the_cakemaker_2017.pdfIn PDF document text
    • http://se-mrush.com/insinkerator_555ss_manual1u4hz.pdfIn PDF document text
    • https://jikujumek.weebly.com/uploads/1/3/5/3/135318263/f7f6dae0eef4d.pdfIn PDF document text
    • http://ubzvp.com/fuzotexesoxakitipamejitegl713.pdfIn PDF document text
    • https://radolawijukigi.weebly.com/uploads/1/3/5/9/135992833/mabuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376598/normal_5fe0df6b39cac.pdfIn PDF document text
    • http://firstdoctor.xyz/xazadudafopatofoluma1q3jo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fizup/westlife_queen_of_my_heart_lyrics.pdfIn PDF document text
    • http://magivaxinel.rf.gd/android_studio_emulator_review.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/vosujugag.pdfIn PDF document text
    • http://xivegujox.epizy.com/best_warlock_guide_wow_classic.pdfIn PDF document text
    • http://lazazowoj.epizy.com/lightroom_cc_mobile_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/bhojpuri_chaita_video_mp4.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 4968 bytes
SHA-256: ee0de80c9f13ad16fb976bb5ce263477665068c08877da2cf403f3298d3769b3
font_01_sfnt_off0000ea16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA16 10396 bytes
SHA-256: 9a27d656269403bd9c27f6830bfb7f77c6f975fd81a3139ea50610b00148e272
font_02_sfnt_off00010d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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