Malicious PDF — malware analysis report

Static analysis result for SHA-256 c580db44239a4961…

MALICIOUS

PDF

107.7 KB Created: 2021-01-13 03:27:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9f651d2d3bd8e51fe32c6570956eca31 SHA-1: ba5e72180de62cd51eb54799cfa93f6b2d27c974 SHA-256: c580db44239a4961b99769c809010d1949be8b8cb96e6f23d0ce0e4464f2e76f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to known malicious redirector infrastructure. The heuristic firings indicate this PDF is designed to redirect users to malicious sites, likely for phishing or malware distribution. Although no scripts were extracted, the presence of malicious links and the ML classifier's high confidence suggest a phishing or trojan delivery attempt.

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://ggtraff.ru/123?utm_term=led+tail+light+bulbs+red+or+white In PDF document text
    • https://static.s123-cdn-static.com/uploads/4391009/normal_5fc4008c7ef15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_5fa969078de00.pdfIn PDF document text
    • https://nanufuso.weebly.com/uploads/1/3/4/4/134443711/72aa8b4dc65.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/Djgijd5/rarest_pokemon_cards_per_set.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383913/normal_5f9fab7ea4d85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449987/normal_5fe4ab29b5e06.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxugaveg/gWrigtg/download_truck_io_mod_apk_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5fd1b8e652d48.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jimugivos/99121216842.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/lubekutore.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/performance_related_bonuses_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/4569528943.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001590f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1590F 11676 bytes
SHA-256: 43373308677ece058c5eda76a211c76b55ca97c1baaeca73c070e2081e55fb19
font_00_sfnt_off0001472f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472F 5260 bytes
SHA-256: cfe73576f151e5435503c97e73a8c3668854802460cb800b556550b6978d641d
font_02_sfnt_off00017a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A07 11380 bytes
SHA-256: 2cc8f7cc47f2cfe477f3e59ec818783857cb9c2c42c0650b2e1bf6e9e3ab60a3

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