Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eac1d96071b6d7d…

MALICIOUS

PDF

78.2 KB Created: 2021-04-22 11:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b4e8e217855d0747db074b032262f70 SHA-1: 746876608e4def49a1457d09714092050313a037 SHA-256: 4eac1d96071b6d7d03d866e39f637c6ad484906f270c389a609cd51bc4482c39
206 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'SE_CALLBACK_LURE' suggest the document is designed to trick users into clicking links or potentially calling a number, leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://xezojetit.ru/strik?utm_term=dyson+v6+absolute+cordless+vacuum+cleaner+battery
    • http://jalazekesofijot.medianewsonline.com/66636799454.pdf
    • http://pedumerik.sportsontheweb.net/how_to_start_a_fiction_short_story.pdf
    • http://niwadeg.mywebcommunity.org/primary_6_algebra_practice_questions.pdf
    • http://jadogaxarabu.mygamesonline.org/25047338783.pdf
    • http://veviwumifuvemuz.mypressonline.com/effective_written_communication.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/25b410aa-2473-493b-95b4-36ac1dd361c8/sesip.pdf
    • https://uploads.strikinglycdn.com/files/b109b372-b022-4b9a-b4cd-74eb1944b11b/sasubegawesavipaje.pdf
    • https://s3.amazonaws.com/kefiperizonofu/construction_company_letterhead_template.pdf
    • https://s3.amazonaws.com/xutomoxu/bimugomedofebubuja.pdf
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_1266edec6ed942de8d1526dce67cd687.pdf?index=true
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_4c16a828e9ce4818a20fc57889b7c4f8.pdf?index=true
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_7bc87a70aac64b908ddf93cfe9a428b9.pdf?index=true
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_b26e620e7c534aa79ddad2b3cd83925c.pdf?index=true
    • http://todifisafi.atwebpages.com/dokivogotosotoloru.pdf
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_0fe5fedac4d74b38958fced9a4a2f46d.pdf?index=true
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_67001a27d22e4743b610ac1c9cff3d6d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0c731d02-4fe4-4ef4-9aca-0bdfa593527e/xuwuzozor.pdf
    • https://s3.amazonaws.com/lebejos/kuvitebutufi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f055.bin
38b08c6741ecc9dc2b897302f95365a407f71bad237b2905a287de3e1d2521dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 5540 bytes
font_01_sfnt_off00010321.bin
92e4e72c6c7f4c64638aeddf8ce59f3fb6eaa015673ce0c41c178d54c7d0a9ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 11228 bytes

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