Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44a87b6fab7492d…

MALICIOUS

PDF

81.2 KB Created: 2021-01-16 01:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 42561160ae3fcc634d8ac281dc043042 SHA-1: 6c7e280c63c87cbf9202488618c4348e0d113e07 SHA-256: b44a87b6fab7492d0558919c131e2a9c2ab96f2d3ac0912ee79229ca9eeca023
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, a technique often used for SEO link farms or to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure (https://cctraff.ru/aws?utm_term=dimensional+analysis+practice+answers+with+work). ClamAV also detected this file as Pdf.Phishing.Trojan. The presence of embedded URLs and the link farm behavior strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/aws?utm_term=dimensional+analysis+practice+answers+with+work In PDF document text
    • https://static.s123-cdn-static.com/uploads/4450003/normal_5ff376e1d81df.pdfIn PDF document text
    • https://site-1176438.mozfiles.com/files/1176438/introduction_to_small_business_management.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389358/normal_5fcfa862f390d.pdfIn PDF document text
    • https://cdn.sqhk.co/mufipofunup/gjioFo0/games_to_play_online_with_friends_free_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5f8ad11709fd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391303/normal_5feea345878bd.pdfIn PDF document text
    • https://rusakubasarozu.weebly.com/uploads/1/3/4/2/134266120/2448865.pdfIn PDF document text
    • https://site-1168088.mozfiles.com/files/1168088/kobalt_power_tool_set_lowes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448103/normal_5fffe27f0e9c9.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/aK5idMZ/coda_meaning_in_spanish.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/minaxigevani/46921710847.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/android_developer_news_blog.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_off0000ffd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD4 5428 bytes
SHA-256: 0fbbabe048d3bc1dcc7f6d6c10bc5f4db2885b900d71781e12a47906cc985089
font_01_sfnt_off00011238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11238 10564 bytes
SHA-256: a2d5bb96ef367a84674866b0bdf6572b9ee7ae5e1b802578fae8c5d9021d6ba2

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