Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58fd864d2785fa1…

MALICIOUS

PDF

76.1 KB Created: 2021-02-16 01:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 978869dde1cbd9fc094b3e016ea12bb5 SHA-1: 873bc9d7fb6fae1bdb08410e474995d5f931a6e8 SHA-256: e58fd864d2785fa166edf1f0a78fac8316a71d24a809be877d4d9017ee4308cf
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/strik?utm_term=how+many+calories+in+an+arby%2527s+turkey+gyro PDF link annotation
    • https://jubibololir.weebly.com/uploads/1/3/2/8/132814038/getuxi_vuzar_pajofofititit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413697/normal_5fd7c25bc2f4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492281/normal_601d02e8a9741.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/pdhhggM/zupuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/aijidge/virtual_regatta_inshore_cheats.pdfIn PDF document text
    • http://artemk.ru/android_room_delete_all_itemssoy6d.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/dgcfij0/color_switch_ios_app.pdfIn PDF document text
    • http://techanomic.com/voltage_regulation_and_efficiency_of_transformerjzenm.pdfIn PDF document text
    • http://feedbacrnz.space/can_you_patch_concrete_in_cold_weathervnjbn.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/bhaOJpb/praise_and_worship_songs_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465386/normal_60218c11a7792.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/ejijfov/42687172908.pdfIn PDF document text
    • https://cdn.sqhk.co/mixirulizab/hi0BgcU/imploding_kittens_cards_list.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/a5c9499.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389127/normal_5fc761414e6ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bupujipa.epizy.com/beginners_guide_to_ketogenic_diet.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_off0000eab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB2 5512 bytes
SHA-256: 3957e6d496e5b9446c7c9623d5110780fc6c4f615e77859317464805e74729f3
font_01_sfnt_off0000fd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 10832 bytes
SHA-256: 6314bf03fe06617ccdd108699ed03e8dc95927da6562bb1b6d202d295724d579

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