Malicious PDF — malware analysis report

Static analysis result for SHA-256 da87b5d27b30050c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 08:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf6bc19882ca80e54ae872f50ab8456f SHA-1: b9cbb8162efa8f8b46537e4a8a87be9101f5d8ea SHA-256: da87b5d27b30050cc84b2bc98eac751f0e80ea1da7d903a9ff68cc1128c7f066
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness, and the PDF structure with multiple distinct hosts and UTM parameters points towards an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 4

  • 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://laborke.ru/uplcv?utm_term=can+i+do+facetime+on+an+android+phone PDF link annotation
    • http://logtech.cz/foto/Image/file/22577407256.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/jidili.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/xinuvovinomisojerukaji.pdfIn PDF document text
    • http://dsraxys.com/uploads/julilunis.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/gejiberofiwix.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161345c8cc8a6a---60667969548.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/9618493200.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/67593728529.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/netun.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/lixumijagemetopatag.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/risoxag.pdfIn PDF document text
    • http://carszana.com/image/upload/File/35532210348.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/pozel.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/lazimewemisoged.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/3734260653.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/kawafibonuwojerovema.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/37783284228.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/pabejopijabazeworir.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/woxosokiwopijilaloboxip.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a78f48b38---foniwegadiboxepopufomuz.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109021322207571.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/faritamifozamomujobiro.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_off0000d848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 10704 bytes
SHA-256: 263c9839c2b660e8b54bb86fbfe8ce4a4209a22828c6ff8caa5ee572cb4165de
font_02_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 17256 bytes
SHA-256: ef59048e6fdb7a1b0f165c76c2e1e141eacd1d3c93b5b1fd58de056e9ed0be02

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