Malicious PDF — malware analysis report

Static analysis result for SHA-256 6536efc6dc62d9e0…

MALICIOUS

PDF

72.0 KB Created: 2021-02-22 07:59:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c9eeb489cfa498d313a3db104e80b41c SHA-1: c3c2292c153fe893c04af86beb352fd89f17817c SHA-256: 6536efc6dc62d9e019f873e027d30a97911e7c3de2040b48855fa949d50354eb
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or redirectors, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=integrative+therapeutics+theracurmin+reviews In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5fd15b4cc8e9e.pdfIn PDF document text
    • https://kolukofutire.weebly.com/uploads/1/3/0/7/130740340/6699689.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/jc2vjfY/super_dancer_chapter_3_audition.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/9213823.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/nGjgRhd/toca_life_town_apk_ios.pdfIn PDF document text
    • http://bezigex.iblogger.org/timeline_template_material_powerpoint_free.pdfIn PDF document text
    • https://lezuzanufebaj.weebly.com/uploads/1/3/4/8/134873312/10317da.pdfIn PDF document text
    • http://sasezifunapa.iblogger.org/gikurigijivi.pdfIn PDF document text
    • http://tegor.xyz/47559331452y3tox.pdfIn PDF document text
    • http://mugedly.xyz/213899752356uee2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425504/normal_5ff49080533f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402737/normal_60007f0c85766.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405181/normal_5ff55339a71ee.pdfIn PDF document text
    • https://nunavataregexo.weebly.com/uploads/1/3/0/7/130775742/ninafema.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/ie2KJSS/zisojufalewurabuwemag.pdfIn PDF document text
    • https://divowotekek.weebly.com/uploads/1/3/4/7/134759223/rafoxe-goviwiji-fodasonejurenol.pdfIn PDF document text
    • https://mutokanapagoz.weebly.com/uploads/1/3/1/6/131606569/famodu-lakowase-mifiji-sugigenuwusawoj.pdfIn PDF document text
    • https://faxezufag.weebly.com/uploads/1/3/0/8/130874059/rixegebevuju-komofevelix.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_off0000d9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 5404 bytes
SHA-256: 27706cb83f53e598af3e1974ee00739e61d84cea47d49c0ba8892081760d2284
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 11580 bytes
SHA-256: ed0be688d8cb58fdeb1ac61e2cb765e3fd4b6e74ce056aad8fbf638a7f8f2f4c

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