Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac7b676a7db7fc7…

MALICIOUS

PDF

82.1 KB Created: 2021-09-23 15:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d5578cb6101c1d65d48d050d0373a7e SHA-1: aa0a9fdf191716ee57300ca7a684279855542aba SHA-256: aac7b676a7db7fc78d6180d7f513b7377d3806157c8216e95347b9685f6debb8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to PDF files on disposable or suspicious domains, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lifeteacher.tw/uploads/files/202109181205014976.pdf In PDF document text
    • https://benhgout.net/uploads/Files/file/245054203.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/46682250852.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/davun.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/34345421406.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/38022166942.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd365dd66f---jutilisa.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/mufoziluto.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/55999528750.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/10158970441.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/74912742597.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/lugupapawa.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/jagewukedorerifetijofiwa.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/6816609324.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/14948345039.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/95487859741.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/86492960280.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/muvewuzepokoradufemi.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/61302641054.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/37566937466.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/95584036217.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/wesaguzazedigedevewu.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/77105007781.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021092315472473499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+pc+crossplay+gamesPDF 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_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 10852 bytes
SHA-256: f0749e759db3bb7d5787f6ba06c71cc956903f73bd07bba05f451db1a97bd738
font_01_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 17684 bytes
SHA-256: 35355b0b68924c396bb5f2eb485a6e99ca795c8a9f2e5763d208f83c4eab7258
font_02_sfnt_off000122b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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