Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af5a65ea1489a40…

MALICIOUS

PDF

85.1 KB Created: 2021-05-04 04:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1ced96b17c2fb5175591952418121eb9 SHA-1: cc014f96ad40d1f679486d2745556071ecba29ab SHA-256: 5af5a65ea1489a403df1c5a30b2db57bf54efd41939140bfe8fdea96bde9ac0e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, one of which is a search query parameter. This suggests a phishing or SEO spam campaign designed to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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+deep+is+town+lake+austin PDF link annotation
    • https://cdn.sqhk.co/ribegibonot/VD0jqjt/puvujap.pdfIn PDF document text
    • http://slimitalia.space/140203017974y7dx.pdfIn PDF document text
    • http://masterpowerpoint.com/rainbow_snake_found_in_florida1g2ih.pdfIn PDF document text
    • http://selectgetc.top/how_to_fix_4c_error_in_samsung_washing_machine_top_loadav444.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/jUoMhdz/guess_the_song_emoji_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/livujiguf/fRgcQha/56688761636.pdfIn PDF document text
    • http://kosonetibekub.medianewsonline.com/bivewurawelitovemebalu.pdfIn PDF document text
    • http://helen-art.ru/69511620339type1.pdfIn PDF document text
    • http://my-favshop.online/tekusivavisosvifeo.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/1B1tiTS/liroduxe.pdfIn PDF document text
    • http://basidugom.mygamesonline.org/minojekamawoz.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/hdZjfeV/legalikarawowolaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_d86324387667490eaea7217eece7d8a3.pdf?index=trueIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_37ce633d35db4af98811db59fa3fc259.pdf?index=trueIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_b2c8ec6f44e141fab53752fa4cc8ee45.pdf?index=trueIn PDF document text
    • https://6214bf29-e628-4b42-ae97-73d9c1931941.filesusr.com/ugd/8c5bc8_38f602b86ee048748e51c6fe44196568.pdf?index=trueIn PDF document text
    • http://nojikigor.myartsonline.com/kubigofamutotilugopuji.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_6b6c24c424574479a373e976d6bbea63.pdf?index=trueIn PDF document text
    • http://pisonepegosa.myartsonline.com/atomic_mass_of_elements.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_9f3cacf62a9a4741b9ef8722fae5c7b6.pdf?index=trueIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_705f15a8907341fb85c5931a26f8f71c.pdf?index=trueIn 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_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 4972 bytes
SHA-256: 51be6f62c9308e83a6a396d22257394f2fb0c56321155b8927aefa806591f266
font_01_sfnt_off00011f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F35 11752 bytes
SHA-256: 7fc4ad54863855173f028346464702eb1ea6bba1bb0f62fd18702c7ed4026f0e

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