Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5243c70e32a94a5…

MALICIOUS

PDF

75.4 KB Created: 2021-01-05 06:30:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2e6bca19bb5a08aefa7acdc591a8249a SHA-1: 89ec5666e1a230f58012ab525f395fc5ea5e94bb SHA-256: a5243c70e32a94a5daea79c539ffc5818ed3953eb574b33266ed6dff6b43cc5b
214 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/aws?utm_term=jennifer+lopez+aint+your+mama+video In PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/7497551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5fc1e69080faf.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/hafjcqX/93450078788.pdfIn PDF document text
    • https://cdn.sqhk.co/jisanipu/cjbjcgh/77585543401.pdfIn PDF document text
    • https://zoradelageruwol.weebly.com/uploads/1/3/4/5/134591251/29473.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/9Ipjcy1/black_friday_deals_best_buy_appliances.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/igm7kib/ios_app_store_search_not_working.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/polojuliragam/18393166157.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/9734324085.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/zafotanolikude.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/88443865500.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/words_that_start_with_sub_meaning_under.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD418 5212 bytes
SHA-256: 98b71706bd5b9fb94e706c5dba6da58390abd8d1711d98dadd65322343e6d7ea
font_01_sfnt_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 11160 bytes
SHA-256: 616e2c528e533643bf907e60a767ca0fd4d447f67fee2451469def925e53abca
font_02_sfnt_off00010c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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