Malicious PDF — malware analysis report

Static analysis result for SHA-256 4603d900017841c8…

MALICIOUS

PDF

113.3 KB Created: 2021-04-03 20:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 437d5ac27055a694579b069097e32510 SHA-1: b09f4fe7989bed8c845ae18767409946fc1e3eee SHA-256: 4603d900017841c87b1e83de45b235425d9cedece6c20fb4017d8583bced76d7
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 by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a phishing or malware distribution attempt. The presence of UTM parameters in some URLs further supports the idea of tracking user interactions for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/123?utm_term=dr+ambedkar+songs++tamil PDF link annotation
    • https://didilajuti.weebly.com/uploads/1/3/4/5/134585724/dubonevosuj-jimobitesozos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471238/normal_5fe42fbc751c8.pdfIn PDF document text
    • http://5coupons.info/nejadutoxidawazofaje3ty5l.pdfIn PDF document text
    • https://guzovadolo.weebly.com/uploads/1/3/1/6/131606502/jerazomitu.pdfIn PDF document text
    • http://luminar2-download.xyz/zotosijojivudpd9zb.pdfIn PDF document text
    • https://mepopukivar.weebly.com/uploads/1/3/6/0/136083549/5f7f977cdf8421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_601152c854a9f.pdfIn PDF document text
    • http://susurrus.space/dopagew8s3.pdfIn PDF document text
    • https://juwujumatel.weebly.com/uploads/1/3/4/0/134042908/68e8f9.pdfIn PDF document text
    • https://povisegidugukab.weebly.com/uploads/1/3/1/8/131871963/6d4d24335d2f7.pdfIn PDF document text
    • http://purpless.vip/kefukaneso0o3g0.pdfIn PDF document text
    • http://batmbatm.ru/xefuwediz1h5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0e1f97ac-72f3-42e1-b5fc-6070d7d7dd5b/tai_chi_for_beginners_dvd_chris_pei.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666ab5f3-83ef-4e9f-82ec-5cca9449ec4b/30680788846.pdfIn PDF document text
    • http://minofadejewezup.rf.gd/wimasugimaru.pdfIn PDF document text
    • http://rukudukewa.epizy.com/anova_sous_vide_manual_setting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/358136ac-15dc-4c31-b0db-961203fb98cb/the_best_sketchbooks.pdfIn PDF document text
    • http://xetobagog.rf.gd/95562634640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9918f4b-25d7-4685-b027-8c66cfc0665f/lixosavoxex.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000161aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161AA 5136 bytes
SHA-256: 713b5f1563ab88ba49a1a000cb7143da2ed45743015878192155c98837100143
font_01_sfnt_off00017305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17305 4308 bytes
SHA-256: 35d7e3fc8b01080d00d1993ba83f4cba4d40e1fb44fd7300425629e137522f88
font_02_sfnt_off0001824e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1824E 11600 bytes
SHA-256: aecba177ab0d1b079f0c80760025f2fad6b7ef47b28f4e52da1d0668249270e5
font_03_sfnt_off0001a9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9D1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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