Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8f3553b8269d1b…

MALICIOUS

PDF

92.6 KB Created: 2021-04-05 16:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f5e36033a0a8a346147a0f324870f281 SHA-1: b11d14f33947cdf359dbd20c5c162d7f910aa125 SHA-256: ef8f3553b8269d1b7ae6f4e2956ce21e394b7232e048cb0297065f0488e2c4d1
156 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 0.9997

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
  • 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.
  • 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://gimoguvi.ru/123?utm_term=leica+m+buyer%2527+s+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366642/normal_6059a00fac775.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481061/normal_5ffd44bdf3d41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421639/normal_603a0b1639b43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389571/normal_6029cb0a13fd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469831/normal_6067dfdfe3031.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418788/normal_60025d0b2aa31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444357/normal_5fca1942052a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/072862ea-8439-4b99-a792-a619ee087d2e/how_many_calories_in_a_taco_bell_chicken_soft_taco_supreme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6799666c-913d-4270-99c1-b90777f0a1ce/73896978347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad7e42a-dcb2-4ef0-a815-379035dd58af/29371378865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/360bd87a-c0e0-4a77-b123-e4798fc34a87/bosch_glm_35_laser_measure_120-feet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50aa7760-8f23-4094-9344-2797ac257e19/dlink_dir-655_default_ip_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fca140fd-56d6-4a9c-8fd5-7e9c023bd9c7/xefokowexazubagajigo.pdfIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_ac76c7c51de249feb53092ab9fd308aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b940c35-577b-43c9-a53c-24d07ef76655/yamaha_ypg_635_display_problems.pdfIn PDF document text
    • https://68f06c25-eb64-4e0a-94e3-a0e33e610147.filesusr.com/ugd/463ace_f34b9beb833f4018813a5d6ef8543aef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8fb9219-3dfb-4790-b0fc-2dcfb9580231/xakujek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fbb417e-1612-45fd-9323-d8cc29486560/keurig_2.0_k-carafe_instructions.pdfIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_cec6662a04904488b2076d191d5e3195.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d0a244b-bd0b-48d6-8397-81d5c942185a/xasaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fae1105-2fc1-412d-a602-c35aad0cd3e5/how_do_i_descale_my_keurig_2.0_coffee_maker.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_off00012ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA3 5444 bytes
SHA-256: 6f68b71bb536464c7acc5cb6095dd6c3379b1969ab918538c973110123b70af9
font_01_sfnt_off00013f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1F 11252 bytes
SHA-256: 03baa34d1aeeb4bebe4679872ac23ffeccd5f2968a3c9a3ec3b8d46acb3fa6e4

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