Malicious PDF — malware analysis report

Static analysis result for SHA-256 99731360e11e621b…

MALICIOUS

PDF

88.4 KB Created: 2021-09-18 14:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 701759c9a909ac964a66e2dd504f1a10 SHA-1: 44732733f5dafae1ee8b6b5b3c059f2b3df2268f SHA-256: 99731360e11e621bb9368716bbd7796edd0493ee3c6f322210964bd633f84479
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, including one identified as a link farm on disposable hosting, and another that is algorithmically generated. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts the user to call a phone number, consistent with callback phishing or tech-support scams. While no scripts were explicitly extracted, the presence of numerous suspicious URLs and the callback lure strongly suggest a phishing attempt designed to trick the user into divulging information or initiating a fraudulent transaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://garglob.ru/uplcv?utm_term=frozen+2+full+movie+online+watch+free PDF link annotation
    • https://alebusph.centralcms.cloud/galeria/files/21168481012.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/bemezenopijulaziliwefitix.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/benujoteg.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/kidorinaxa.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109131348353632.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136383131ff1---katawaparadiparu.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/86784703251.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/labajom.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/lagodiwuxowawipurebifuli.pdfIn PDF document text
    • http://live-net.it/file/busenasusis.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/86588324495.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/34716062204.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210913121414_1281919968.pdfIn PDF document text
    • https://linardi.ru/files/file/97026657980.pdfIn PDF document text
    • http://koddous.com/userfiles/file/48457649142.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/85533991570.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/86657060387.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59a901fff---jamagakaw.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/benavasimuva.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/zomuvugak.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/zewesetifar.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/58159519973.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/furolakuvunim.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://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_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 10844 bytes
SHA-256: 60b634c3860b5d600cf19154721d7a31c0b17b5ac17f5fb118aa782b70706c33
font_01_sfnt_off00010e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001266f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266F 17628 bytes
SHA-256: f4f6b2be6c0fe0d80d9337c1693afa3d6481020315c39018257b63bca6e00b4c

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