Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d983d885ecb069…

MALICIOUS

PDF

75.7 KB Created: 2021-05-08 00:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5b557589f0de8dab26fd4838c127b2ba SHA-1: 564b3d5cb79ecfa4d9425c4b8d075a469d113c70 SHA-256: 27d983d885ecb069361c1b80f9380c37a4bf343ed9af19ce01a93deb4e24d51f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/strik?utm_term=arduino+sinhala+pdf+book+download PDF link annotation
    • https://cdn.sqhk.co/bipadifudame/TgjCiar/entertainment_book_contact_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/dunuxorigu/phVAhzz/33776739634.pdfIn PDF document text
    • http://creditactive.info/1155858112bq1iu.pdfIn PDF document text
    • http://edarudost.online/634320707497d4nn.pdfIn PDF document text
    • https://cdn.sqhk.co/balekunu/haO1fp8/border_patrol_agent_salary_florida.pdfIn PDF document text
    • http://lotto-investclub.com/mf_35_tractor_parts83k22.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/ptGhagf/diy_cat_condo_outdoor.pdfIn PDF document text
    • http://arendagg.xyz/activity_tracker_bracelet_reviewsuy42j.pdfIn PDF document text
    • http://lnstagramoriginal.com/john_deere_f525_power_flow_bagger_for_salehm4fi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_b92f8a13cfc14de4a67bd8c1ed046e71.pdf?index=trueIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_0f944becee9448858c0bb8df1f9f7e87.pdf?index=trueIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_8d196aef50a94dc984d5bdfddd4a4546.pdf?index=trueIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_1c6e81c6a5ae4704a0627f48a338f141.pdf?index=trueIn PDF document text
    • http://pidodexogejax.myartsonline.com/algebra_1_quadratic_word_problems.pdfIn PDF document text
    • http://kamigawox.atwebpages.com/norawagidepidivisiw.pdfIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_f7fad1cdbeb9422daf09424db2e9ba73.pdf?index=trueIn 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_off0000ec30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 5412 bytes
SHA-256: 0b56c0e74d13888fbc5bd8c8a99a3cec144954289fd54d80c7b8b732e6a46eef
font_01_sfnt_off0000fe9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 10296 bytes
SHA-256: 07b1ff974fe4bd08198831232b09ee00426ddb0c3de10174022ab21d77155405

Open this report in the interactive analyzer, or submit your own file for analysis.