Malicious PDF — malware analysis report

Static analysis result for SHA-256 239825afb30ab5a0…

MALICIOUS

PDF

78.9 KB Created: 2021-03-13 21:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 96a6f58caaf84fb27de7e425fdadddfb SHA-1: 508bad6d82fb2996460c6cd043a766453d097760 SHA-256: 239825afb30ab5a0895de37cf1254bc3b79cff28ec07c277376b9b943963fa06
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The primary URL, 'https://soxebez.ru/award?keyword=stoelting+s+anesthesia+and+coexisting+disease+7th+edition+pdf', is presented as a search result, likely to trick users into clicking through to a malicious site.

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://soxebez.ru/award?keyword=stoelting+s+anesthesia+and+coexisting+disease+7th+edition+pdf PDF link annotation
    • https://cdn.sqhk.co/novupezezis/idhciim/nopizimazavuselakamedo.pdfIn PDF document text
    • https://zunuposegilidus.weebly.com/uploads/1/3/2/6/132695990/3146659.pdfIn PDF document text
    • https://cdn.sqhk.co/zapakolozu/ihcyGLk/23560077194.pdfIn PDF document text
    • http://kemytbok.xyz/60224247712zkamg.pdfIn PDF document text
    • https://gedijidejejew.weebly.com/uploads/1/3/0/7/130775336/2465744.pdfIn PDF document text
    • http://shoop-fh.ru/clash_of_clans_mod_apk_apkpure6c2ln.pdfIn PDF document text
    • https://vanizubifimid.weebly.com/uploads/1/3/0/8/130874516/kidoseniparuk.pdfIn PDF document text
    • https://latowinu.weebly.com/uploads/1/3/4/5/134508675/tonozam.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/7d0ad241-be97-472d-91ea-bbc1ffa9f2c5/university_physics_12th_edition_solutions_manual_online.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/carolina_hurricanes_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22acfac4-5bcd-452f-a524-67213760bef4/gekibarobejudofu.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/julakopesavubudilewine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/726ee568-4bac-42ff-a3a8-a461616bbc15/93838781162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b3a2c4e-4091-4e90-8bc1-28fd731b89fa/why_does_it_hurt_to_touch_around_my_belly_button.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 5572 bytes
SHA-256: 6dc4dce7c67820dff1bb9db700a36f94ba38cda99d5c72ace360e3dafe648465
font_01_sfnt_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 10668 bytes
SHA-256: 15146a2f7eb53444c4ac1602a9ac14199578ab9f486bda90377e205d42886c86
font_02_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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