Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8676b6228f6e31…

MALICIOUS

PDF

82.3 KB Created: 2021-03-19 18:37:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5e3ef3472e742e530ffa322876b06f30 SHA-1: 1e6b808485522a93fdebecfffbcd0697118512f4 SHA-256: 8d8676b6228f6e31f09cdd97ad0b06882ce539f59f75d0514c490198b191bc45
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. One critical heuristic indicates the PDF links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the PDF structure and embedded links strongly suggest a phishing or malicious redirection attempt.

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
  • 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.
  • 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://crophysi.ru/wix?keyword=cyberpunk+2020+combat+sense In PDF document text
    • http://changely.club/clasificacin_de_nmeros_ejemplos7849i.pdfIn PDF document text
    • http://tevfikyuce.xyz/sharp_aquos_quattron_lc-40le830u_manualz167a.pdfIn PDF document text
    • https://debeseroduk.weebly.com/uploads/1/3/4/4/134467522/95c8e0076985f.pdfIn PDF document text
    • http://sdek-24.cc/987401375952bw0f.pdfIn PDF document text
    • http://kellys.space/tabletopia_steam_loginz617i.pdfIn PDF document text
    • https://kewejalafu.weebly.com/uploads/1/3/5/3/135329801/2d35f2ace4.pdfIn PDF document text
    • http://hamsterbig.com/free_flyer_template_powerpointajafk.pdfIn PDF document text
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/lifur_fusekazo_nitomumuxipu_fozupejupokowa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/varolexexus/nuvuzorugosavekadesat.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/sports_illustrated_swimsuit_2018_athletes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96bd476d-2ac7-4a6c-8ab5-9b62526ae40e/how_old_are_the_baudelaires_now.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4717e716-44b4-40fa-b080-160c538973d9/webej.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/83120595553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b712cd5f-4a17-48f6-800a-7eca8487f9d7/pixalujebeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1cd1039-b74d-47be-8ea5-80d10d7cdef1/34108920194.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/68929341422.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/burberry_coat_sizing_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ba182a-76a6-4a9f-9522-7e3b6919f44c/vufitetajoraxagoxezoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c93768e-b586-41be-b215-c31ef29253f4/mowonuwedukifutalir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b91d50-33a8-4b62-a555-4db385d8814c/how_to_fix_air_conditioner_fan_motor.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_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 5532 bytes
SHA-256: 655662565512ecc2e6ccb6f0d7b4bdab95ef33a9aee84f21faafa91d8a062bdc
font_01_sfnt_off000117e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E7 10604 bytes
SHA-256: 2325b28f50a60668df8d78af12ba315246c6d4bbb1dcd8ab66a6a421188c448a