Malicious PDF — malware analysis report

Static analysis result for SHA-256 4284ddb27433cda3…

MALICIOUS

PDF

67.9 KB Created: 2021-02-05 16:38:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ec7308ca4a5805026be3e7d146eab902 SHA-1: 1c39aa376f4c9eb315316781d8ba8436c837ba81 SHA-256: 4284ddb27433cda3db30c503d57c10803551110d40f30ac5fa642a8b1d28fdce
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or scam attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though partially corrupted, suggests a lure related to medical supply coverage, which is likely a pretext to drive traffic to the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wb?keyword=dhs%20medical%20supply%20coverage%20guide PDF link annotation
    • http://secureappeal.com/xetedudezonauzowm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411252/normal_5fe00e7a07c72.pdfIn PDF document text
    • https://fekodajitor.weebly.com/uploads/1/3/0/8/130874258/68c41f815ced3f.pdfIn PDF document text
    • http://all-host.site/anstoss_3_windows_79tqi1.pdfIn PDF document text
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/9e4ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455198/normal_600a54d775cfd.pdfIn PDF document text
    • https://cdn.sqhk.co/xavipinav/jdQthej/82650283061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_601093f9bc555.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafaveju/djfidKR/40035757979.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366040/normal_5ffa97d954de7.pdfIn PDF document text
    • https://cdn.sqhk.co/fakupavod/VO3Riid/super_wings_jett_run_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/wejideduv/aFcW9tZ/18687914632.pdfIn PDF document text
    • https://kovunigok.weebly.com/uploads/1/3/5/3/135317038/dobiliwuraxu_bejiwilaf_dakagudebi.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/cXb7dhd/29978167932.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ccf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF5 5648 bytes
SHA-256: bb7e11af74884aa2f2fd6a4e47584f69dbbb93a523c9333a363ffdcaedd95401
font_01_sfnt_off0000e014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE014 10244 bytes
SHA-256: cb82970bec3c3f7b48fc1b53ff89f8a6a1acf957cf22a7af598a23d9c495ae1d

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