Malicious PDF — malware analysis report

Static analysis result for SHA-256 994cfbfe92c69579…

MALICIOUS

PDF

97.5 KB Created: 2021-02-22 21:54:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a5241b2048ee2a9ad06a6f25134e41b4 SHA-1: d0907231b61cda89efe34ba3ebc3722a3e7723bc SHA-256: 994cfbfe92c69579fc3947fb5479f70a097842e3ebb7ded4bdb3a4b466a67e4f
214 Risk Score

Malware Insights

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

The sample is a PDF document containing numerous embedded links, many of which point to external resources. Heuristics indicate these links are part of a link farm designed to redirect users to malicious content, specifically identified as a phishing or trojan distribution attempt. The presence of multiple suspicious URLs, including a known malicious redirector, strongly suggests a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://crophysi.ru/123?utm_term=cisco+catalyst+2950+power+supply In PDF document text
    • https://tojabefe.weebly.com/uploads/1/3/2/3/132303019/ae9b50e2ad4.pdfIn PDF document text
    • https://vukezozonobobex.weebly.com/uploads/1/3/1/3/131383599/69ac849.pdfIn PDF document text
    • http://moneyindia.site/derwent_inktense_pencils_review9s05y.pdfIn PDF document text
    • https://fomimelagesuto.weebly.com/uploads/1/3/1/4/131406840/f987de974c.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/nedijenixejitewevilo.pdfIn PDF document text
    • https://pojojupekofep.weebly.com/uploads/1/3/4/7/134754506/9896493.pdfIn PDF document text
    • https://jajajijonox.weebly.com/uploads/1/3/1/4/131453539/b3b68cd6ace3810.pdfIn PDF document text
    • http://complect-tech.ru/121258184215o8if.pdfIn PDF document text
    • https://vamarimorojikav.weebly.com/uploads/1/3/4/6/134640123/68d93f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gavojomizam.epizy.com/my_aged_care_assessment_manual_march_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/68594969205.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/mivufotemufonebefarazolel.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/android_tv_box_x10.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/6210474809.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/kewopokerasovel.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/certainteed_landmark_ir_data_sheet.pdfIn PDF document text
    • http://gigavolaxo.epizy.com/joroburovozidarunetixu.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/anybody_can_dance_songs_in_telugu.pdfIn PDF document text
    • http://jifunujori.rf.gd/wrong_turn_2_full_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/khalifah_bani_abbasiyah.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/rotupipokogorotu.pdfIn PDF document text
    • http://bakenexiradofo.epizy.com/how_to_write_a_laboratory_report.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_off00013a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A09 5580 bytes
SHA-256: 0cc09134f4ef17375883d9cb2f5bb310eb43b182286a7f9d7ff434f4ee333963
font_01_sfnt_off00014d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2B 12392 bytes
SHA-256: 5cd8d20786e46d62d99cf03c0c8c128c4a1652bd7ef28cbeb9a18ece99bc4a1e

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