Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab19c4470622a8eb…

MALICIOUS

PDF

76.0 KB Created: 2021-02-17 08:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2c611df06bd69ce590e34475373f1ca7 SHA-1: fbe191fa77968244330299e40fa908f1a77cf06c SHA-256: ab19c4470622a8eb586e6e7c291e0b59e239fc531285edee324ef516fc1dc879
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the nature of the embedded links and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=how+much+is+j+prince+worth+2019 PDF link annotation
    • http://akmurzina.com/combat_tv_series_downloadaghfz.pdfIn PDF document text
    • https://sekugiwa.weebly.com/uploads/1/3/0/7/130739582/8419097.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490534/normal_5fe5afcc2d87f.pdfIn PDF document text
    • http://lazerepil.site/49200779165z932z.pdfIn PDF document text
    • https://faxakitowe.weebly.com/uploads/1/3/1/4/131437357/jarozipisa.pdfIn PDF document text
    • https://xibuzapesajeg.weebly.com/uploads/1/3/4/2/134236274/4247737.pdfIn PDF document text
    • http://tehnopolis.org/57971920480v81xu.pdfIn PDF document text
    • http://musc-media.xyz/median_xl_guides2vrng.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494430/normal_602742b341a29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486199/normal_5fc6dc1832435.pdfIn PDF document text
    • http://copalofa.site/85098898518lq65l.pdfIn PDF document text
    • https://nabivedoki.weebly.com/uploads/1/3/1/4/131407492/zafafovabuxusap-deniwan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376856/normal_600364adec4b8.pdfIn PDF document text
    • http://seduxizewumi.iblogger.org/aged_care_menu_guidelines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vibulowivez.epizy.com/77225848099.pdfIn PDF document text
    • http://xigesema.epizy.com/how_to_freeze_panes_in_google_sheets.pdfIn PDF document text
    • http://mirepili.epizy.com/wakazizik.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 5544 bytes
SHA-256: 72f811122b10fc124ee4aeb4c93a27f4838593a5d22d4a67774479e4b7be056e
font_01_sfnt_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 11544 bytes
SHA-256: 8d011ad2f36474d9297b9e7f4cc8753732a4841d19126c4acd64f6808bbe9f39

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