Malicious PDF — malware analysis report

Static analysis result for SHA-256 b137fd6136f10cf9…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 01:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a70eab36f55ce73060339519301f9481 SHA-1: 355a2678b1b2da147555bf30cc68607fed44b599 SHA-256: b137fd6136f10cf9418bdfc17f23ca84230f8e4aa20a39cbf6e6ae4a2d7f04f2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=fifty+shades+darker+movie+download+toxicwap PDF link annotation
    • https://excore.hu/ckfinder/userfiles/files/50538124911.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/wamakugejedaremizuduvo.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/vopip.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161476b4d314a5---raritaboluregunapebofa.pdfIn PDF document text
    • http://ore-processing.ru/d/files/29292076487.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161428c569509f---jolapaduga.pdfIn PDF document text
    • http://idcla.net/upload/files/fujesedesutunon.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/5748614916.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/wenoxunewudugisikamebep.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210905_213630_188.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/71112857574.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/29714490222.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/nolitamujukofunuwowu.pdfIn PDF document text
    • http://redactron.com/userfiles/file/liwivave.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/44043010529.pdfIn PDF document text
    • https://avukat.kocgrafik.net/upload/files/58358945972.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/ditutegalebimefopuvene.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/fufenatofejagakovipanitop.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/44340460026.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/67466896847.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/13965552224.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210902/files/20210902042052.pdfIn PDF document text
    • https://satesayap.com/contents/files/48088304032.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/tuwiwara.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/31758146203.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_off0000b240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB240 14664 bytes
SHA-256: 1b562bc6ec08acacfc0c06c59f8b7b1b59e83fd832272b1e62858b9f871b6ce3
font_01_sfnt_off0000d6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 11320 bytes
SHA-256: 4a367c3850286caad46c5b98dcfa56cef91190cb132fcd992098887cd074abcb
font_02_sfnt_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1