Malicious PDF — malware analysis report

Static analysis result for SHA-256 545efe0c9056be69…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 23:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e965fe4483dddff41a39090a7ea0b2bf SHA-1: 1492681ea447bfd538539a6938179ac9423db3d0 SHA-256: 545efe0c9056be6976881178bdd880d918f99807936b87ab8032158d00569286
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to other PDF files, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to manipulate search results or distribute further malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://pincailight.com/zk/UploadFile/file/2021090122043773499.pdf In PDF document text
    • http://pronobile.com/catalog/file/vopiduv.pdfIn PDF document text
    • http://pactolous.hu/upload/file/52807974084.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/72470481582.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202191123335040.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/gobafivurafupumowob.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161303ea6b164e---xudobusuderul.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/neloborifovowusewofifi.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/galamegulaga.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/tepavitoj.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/videtuzevalelenas.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/potagaxirowojiwapexi.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/14132862121.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/rekuzowizov.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/guropomiviwetexikamerafot.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/kikubopaxes.pdfIn PDF document text
    • http://cascad-trans.ru/files/74283877002.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/lipegepigukigerifoze.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/nabokozigen.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/46527454032.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/vajuva.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109080715292123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+make+apps+float+in+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001004a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004A 18056 bytes
SHA-256: 8a9ba8ed4d59a3e342a162d5b801cc315e916943e62ff01a39f440a454bbe845
font_02_sfnt_off00012f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F33 10828 bytes
SHA-256: 79c39ab9bb41e7a135aa91b9d0280f19d6626e23b682f08db0be74d04605a7fc

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