Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4ede23081d2016…

MALICIOUS

PDF

77.6 KB Created: 2021-06-10 10:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ca24c4122735c1c4dbd23bd4dee60da5 SHA-1: 95dcc91f4464c211148ed81062ddf22cbd0f882b SHA-256: 3b4ede23081d201643909cbdadc9a1641903d752142282cfceba949de66552a6
186 Risk Score

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 0.9994

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://huntic.ru/pbw?utm_term=a+christmas+carol+for+children%2527s+version+pdf PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4454559/normal_60b1aafc00475.pdfIn PDF document text
    • https://nazafusi.weebly.com/uploads/1/3/5/2/135297870/fovufazobatubejog.pdfIn PDF document text
    • https://penatiwateli.weebly.com/uploads/1/3/4/6/134617533/4314168.pdfIn PDF document text
    • https://genopajixon.weebly.com/uploads/1/3/1/4/131452954/fc5cd290b155.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/5839332.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/kuxorupodaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461766/normal_60b8b68ac6e77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_60488ddd73633.pdfIn PDF document text
    • https://nopirirog.weebly.com/uploads/1/3/4/2/134234714/1861238.pdfIn PDF document text
    • https://tukusalo.weebly.com/uploads/1/3/0/9/130969921/8560082.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fadoposapat.pbworks.com/f/48879767284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a9a391-43e0-4551-9299-aef16c74bb18/spanish_words_in_english_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4afbabad-7f21-43b1-be34-a83739690a51/zoxobobawifa.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/f/control_systems_book_by_nagrath_and_gopal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b5bb8c-f2ed-4c3b-ab2d-f9a773e2df11/why_is_my_shark_steamer_not_steaming.pdfIn PDF document text
    • http://jopamedet.pbworks.com/w/file/fetch/144450297/lesson_plan_for_physics_class_10_cbse.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/f/76506025895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f17f289e-40d3-49af-8585-c2509736316f/sherlock_holmes_volume_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77678a5b-3858-4ff4-b3a2-b01c76f71397/56808313229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f88f2a6-e82d-4958-9bad-07935992c521/28948639303.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/40787218151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c173ab-1812-4b55-91fd-08c0d5cd3d7c/nikon_d5200_battery_price_philippines.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 5268 bytes
SHA-256: adcd879e50d6df19c4eb119bb5893e2d35412871c5befe9ad6c1e0b2d439b38e
font_01_sfnt_off0000f40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 11236 bytes
SHA-256: 83b11bd6c56e876e26cbfe6701b5f5ae0d582b4f6cd2ea041f72ceb5721dd060
font_02_sfnt_off00011a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A31 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34