Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba43ab1ea270a21…

MALICIOUS

PDF

115.1 KB Created: 2021-04-01 10:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 24ede94b5b68fa883326673f22e409a3 SHA-1: 39f07e7fbe071846fca2b6f876555506c6e537fa SHA-256: 0ba43ab1ea270a21e52067d5ac8dbd320139d5dcb499ea681f65b013e9d6e3c3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable or suspicious domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful content.

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/award?keyword=vocabulaire+anglais+financier+pdf PDF link annotation
    • https://pekupepavipojev.weebly.com/uploads/1/3/1/8/131872203/9ffa9.pdfIn PDF document text
    • https://bobidowi.weebly.com/uploads/1/3/2/7/132740787/6762977.pdfIn PDF document text
    • http://itdiscount.pro/9927065063958sw2.pdfIn PDF document text
    • https://lalojitewimagix.weebly.com/uploads/1/3/5/3/135304200/6729606.pdfIn PDF document text
    • http://roburupagosode.iblogger.org/tegosimofavofadewomipez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378834/normal_5ffbdd7ccea64.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/2753163.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530070/normal_5fe48c8944e42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_5fe6d797475df.pdfIn PDF document text
    • http://dusalawolut.iblogger.org/bhagavata_purana_book_10.pdfIn PDF document text
    • https://gazekusiparisom.weebly.com/uploads/1/3/4/0/134012522/julasomotobo_xiwuwewu_demunuxijaret_lavug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375207/normal_5fda54bfdb163.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fazitewem.rf.gd/gidemewinufebatebulawaru.pdfIn PDF document text
    • http://dulefuzobov.rf.gd/28315823277.pdfIn PDF document text
    • http://kodosalepixalan.epizy.com/zulagelubunanuzafugun.pdfIn PDF document text
    • http://vanuragevexofe.rf.gd/liftmaster_will_not_close.pdfIn PDF document text
    • http://neveket.epizy.com/52197529715.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_off0001858a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1858A 5428 bytes
SHA-256: 83f961e914f11e78e90038cf846cd2bc5f354b2451db5d60ee5a78d49cf8ff6e
font_01_sfnt_off00019805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19805 12288 bytes
SHA-256: 465ba787320836738e610febdec9d4ca118d7354ecbcbe0c37b9cafd6b34ef6f

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