Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca98828d3f30b1d2…

MALICIOUS

PDF

114.9 KB Created: 2021-03-28 11:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1f7ef4fe7b23301b086eb91550576663 SHA-1: 99807130377860c3b5c180aefd6a072047887133 SHA-256: ca98828d3f30b1d20029d344871ac868214e2b9230aaed3ee4d9a5ff60a34020
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The embedded URLs and the PDF structure suggest it functions as a link farm, directing users to potentially harmful websites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/award?keyword=badminton+rules+in+gujarati+language+pdf PDF link annotation
    • http://betmoy54.com/488477169058e87u.pdfIn PDF document text
    • https://vegilirebaj.weebly.com/uploads/1/3/1/0/131070576/4927634.pdfIn PDF document text
    • http://profaudit32.ru/50362515779ct68k.pdfIn PDF document text
    • http://urolog.xyz/942423908004vttc.pdfIn PDF document text
    • http://lenudes.com/do_lifters_help_with_deadliftse8k5p.pdfIn PDF document text
    • http://udilische.club/3d_photoshop_cs6_software_free50rf9.pdfIn PDF document text
    • http://gatorama.fun/gubadojeguwejojg2.pdfIn PDF document text
    • https://meruvaxog.weebly.com/uploads/1/3/4/8/134877221/1233514.pdfIn PDF document text
    • http://fullhp.info/rupert_sheldrake_librosf1h9r.pdfIn PDF document text
    • https://lodofimedama.weebly.com/uploads/1/3/4/3/134327961/7249144.pdfIn PDF document text
    • http://websporizle3.com/pukugited54jts.pdfIn PDF document text
    • http://uscreditmonitoring.info/20786901570o5i02.pdfIn PDF document text
    • http://daliadiago.com/radical_mycology9j1tv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_f6f3a77668ac402ab88c3bb1072a304d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4662e24-0f7f-4f1e-aec2-96b33518b2a9/what_is_a_mystical_shaman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d8cdf0-8a92-450f-97f2-fc8e9a3ddfe5/32774916643.pdfIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_9dbef02ac50949d4975a8184ba2ed513.pdf?index=trueIn PDF document text
    • http://negumigimewote.onlinewebshop.net/pudif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d42ba5c-c50e-45de-a35f-da39d427ce0c/11734718243.pdfIn PDF document text
    • http://roxujewov.myartsonline.com/rig_veda_malayalam_translation.pdfIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_69e0c8ad1aa9454e913d82a8d879266d.pdf?index=trueIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_f81971e187894522b8e30a685a60e00f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3f71ca7-5e1d-413d-a072-9f31048d724b/hcn_ionic_or_molecular_compound.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/mumitufaxolazinorexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c80dde5-ae65-42a9-bd25-e24508f5812c/91187315191.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000181fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181FE 5488 bytes
SHA-256: 1c6184bfd66c245448b975933842f99766f652be4da39a2c4ac5bc338a340709
font_01_sfnt_off00019498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19498 12452 bytes
SHA-256: e93c08ab552cf31328b6185bb9fe8aa9336665fc6ec32a4ab0d99e7fafd55338