Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c01c5c7debd011…

MALICIOUS

PDF

139.8 KB Created: 2021-03-02 08:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e641dadcd3cec046d10bf0ed7c87c4f2 SHA-1: 62be6ca882c4c13f5e6f4a8e78a915a73750d7aa SHA-256: b2c01c5c7debd011068270afe5a57c5a1a048fede3c9cc55a923d1cc78965eea
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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.
  • 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://yafferge.ru/wix?keyword=tanaka+personality+haikyuu In PDF document text
    • https://fazugiwe.weebly.com/uploads/1/3/4/0/134012697/fokefiwunawi.pdfIn PDF document text
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/9463474.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/what_is_tcp_ip_port_for_printer.pdfIn PDF document text
    • http://bodugupuk.22web.org/gunizozoxukoludabavaju.pdfIn PDF document text
    • http://titodisoke.22web.org/70389275268.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/c0jeVjg/space_shuttle_simulator_hd_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471092/normal_6008cdfa079be.pdfIn PDF document text
    • https://viwomesaw.weebly.com/uploads/1/3/4/4/134472777/f9c2af2511.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_6002d5cd0cdfb.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/what_are_the_principles_of_design_and_their_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/gozawelesutu/ejgiiiW/51150469648.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446395/normal_5fcd0ca0b1b4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • http://woxepakaj.epizy.com/magritte_museum_audio_guide.pdfIn PDF document text
    • http://zimopup.myartsonline.com/system_dynamics_karnopp_solutions.pdfIn PDF document text
    • http://nununad.myartsonline.com/rusagamadirab.pdfIn PDF document text
    • http://disoluje.myartsonline.com/puguwamozifi.pdfIn PDF document text
    • http://gugogedufos.epizy.com/o_capitalismo_para_principiantes.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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17105 11856 bytes
SHA-256: 82febabc86cbaf42a2d5f314b507612fda5a31831dd42de20bde0d7a99bbbdd0
font_01_sfnt_off0001985a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1985A 5024 bytes
SHA-256: f087cf87ef879e4d88f87793cce402d8a4e377603d44b45c5d66afea7bf4abdc
font_02_sfnt_off0001a979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A979 9316 bytes
SHA-256: d9d66786b5c3cc83b36196071bdfdcf7ce6b6bfb095741c0a352d0d2b5865425
font_03_sfnt_off0001bc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC51 2152 bytes
SHA-256: e61cf0c6a71cfd2a0adf4c12559291db356d9c0b3c431b5f77a3f6727d9608d2
font_04_sfnt_off0001c566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C566 3768 bytes
SHA-256: e345fc3c914679c89ffd5935506e2c992335f95c475539669bbde865af019c48
font_05_sfnt_off0001d0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0D9 10880 bytes
SHA-256: 31550298105772112c19a5c5abed69c2ba0f49c6150b72cf72222ad67705df0b
font_06_sfnt_off0001f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F664 17220 bytes
SHA-256: 82d6b616dfb9e005611b93ece4e941ea6a789156f03c348eff68abe689eb8636
font_07_sfnt_off00020fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20FC7 6072 bytes
SHA-256: 10f53bbdfd9307d2461c0662b5f0a794fda59a0275963d5c2aef921d4b278712