Malicious PDF — malware analysis report

Static analysis result for SHA-256 6200e8ed28cdcaf0…

MALICIOUS

PDF

73.4 KB Created: 2021-02-21 08:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 651e5d6940d8d84be016929597b3e257 SHA-1: bff0ccbc94b400dd6b79292163f0dbaa9787d3a5 SHA-256: 6200e8ed28cdcaf07ac9195311485bbd37bcff49bb68587991c25df3b1eef98e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though partially corrupted, suggests a lure related to a 'Sap for beginners book'. Numerous external URLs are embedded, many of which are hosted on disposable domains, pointing towards a link farm or phishing operation. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://jacksth.ru/strik?utm_term=sap+for+beginners+book PDF link annotation
    • https://wotakowa.weebly.com/uploads/1/3/4/8/134885303/1348560.pdfIn PDF document text
    • http://strapslap.online/fnaf_4_character_guidehitsj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_5fe7076450d81.pdfIn PDF document text
    • http://chambre.xyz/essentialism_definitionpkzsp.pdfIn PDF document text
    • https://cdn.sqhk.co/wugotiparo/PeDiahb/54672713478.pdfIn PDF document text
    • https://cdn.sqhk.co/xizefonuma/gi8qhhi/smash_ball_2020_results.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486969/normal_601071df1e60f.pdfIn PDF document text
    • http://plusstore.pro/allotment_of_shares_form_in_mcanvbl2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5ff2b16d52c2c.pdfIn PDF document text
    • https://malitorenifavo.weebly.com/uploads/1/3/4/0/134017021/4895622.pdfIn PDF document text
    • http://bigowet.xyz/635219162883kywu.pdfIn PDF document text
    • http://netewe9.xyz/242415663367y0yb.pdfIn PDF document text
    • http://zootime.store/3117178229844qay.pdfIn PDF document text
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/serowi_fodopumajed.pdfIn PDF document text
    • https://resewirebibabap.weebly.com/uploads/1/3/1/3/131379054/ribamosumejuw_bironogoj_sokix_furewadogolife.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/ihFy7zK/q_tickets_movies.pdfIn PDF document text
    • http://smallita.space/craftsman_truck_tool_box_accessoriestpqyq.pdfIn PDF document text
    • https://cdn.sqhk.co/divabasom/Ehfjijg/spacex_jobs_dallas.pdfIn PDF document text
    • http://usejus.club/broward_school_calendar_20209tpw6.pdfIn PDF document text
    • https://finirawex.weebly.com/uploads/1/3/2/7/132741073/8327330.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/3230048.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 5344 bytes
SHA-256: 5201f45a4603acaad33ebc040babb11204b5702853f7effdee822e412f858b21
font_01_sfnt_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 10652 bytes
SHA-256: a526679c1df666eb539e54d9f0c448a990077e2b0adce008f6ea09942c3b6a8d

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