Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f564acbdee5eaf…

MALICIOUS

PDF

76.1 KB Created: 2021-03-24 00:04:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 981ceb9ef958bc7501ef5fca4304147b SHA-1: 2126889eee54704ec77dd42a9cc2e0bd74394f14 SHA-256: 19f564acbdee5eaf1f25baa43fcafe26cc2aa01363531f9e1894400a7ebe1a09
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of links suggests a phishing or malware distribution attempt.

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 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://dafemum.ru/strik?utm_term=yamaha+dgx+505+specs In PDF document text
    • https://cdn.sqhk.co/nigudovowa/36hjZha/majanifuxilumazali.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilobup/ihkk0O5/dunudafuxejojefinezusu.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/cruOqmL/vafutezatufupube.pdfIn PDF document text
    • http://uchebnoe.website/followers_over_time_twitter2a1gw.pdfIn PDF document text
    • http://nonly.xyz/zumepidedamimalaxonnsofj.pdfIn PDF document text
    • http://chisto-chisto52.ru/34838234288e2hzw.pdfIn PDF document text
    • http://callipakk2.site/14523216990wv1h.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwokosokif/ibWQgzr/amazon_echo_dot_with_clock_nz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460231/normal_604ee316e1937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447903/normal_5fd289e45be99.pdfIn PDF document text
    • http://ing-cliente.com/hemoglobin_a1c_chart_average_blood_sugarstl1o.pdfIn PDF document text
    • http://4gusevshop.space/what_happened_to_richieu_in_maus0stsl.pdfIn PDF document text
    • http://idealica-official-it.website/air_horn_sounds_free5mgz6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_b1b728fcc6624e7087554c0652c19acd.pdf?index=trueIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_263e3f04dafa4e7ab15b701054889ebf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/why_is_the_melian_dialogue_important.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/78443280609.pdfIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_18e1d2b617964096a167ab4b25fdd0e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dusined/vehicle_tracking_system_project.pdfIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_3d7780e851914da0b395e3d4788954d1.pdf?index=trueIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_427c595d87574f36b5fe75dafe5c23ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fezenur/warakekasarafaris.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_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 5652 bytes
SHA-256: 7b9e2beae700629599f16083d08176c1ab3c0e58355b43cf81dd9baf48b8c748
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 11664 bytes
SHA-256: d38b91703a55c5776b373d61eb0a81091046f959874279489601d64755b73c39

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