Malicious PDF — malware analysis report

Static analysis result for SHA-256 5978bc87f5d2c238…

MALICIOUS

PDF

77.7 KB Created: 2021-03-07 11:21:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8495351f9a9bd5a5ce227bbf121a9b99 SHA-1: ba92ff02f4a37245014254983b13fbe19a0fdba0 SHA-256: 5978bc87f5d2c2387007777d64f1c4f8628fa05815c6fed08bce89815b388ed2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and link farms, strongly suggests a phishing or malware distribution campaign. The document body content is heavily obfuscated and appears to be junk data, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=what+will+a+honda+eu2000i+power PDF link annotation
    • http://blockhcain.host/citizen_eco-drive_promaster_skyhawk_a-t_watch_jy0010-50ezrk48.pdfIn PDF document text
    • http://nicepics.xyz/65650140093e5eiy.pdfIn PDF document text
    • http://1xbets-reg.site/d_and_d_5e_monster_manualzt26u.pdfIn PDF document text
    • http://datingsexchat.site/easy_vegetarian_indian_dishes_for_dinner8tfhc.pdfIn PDF document text
    • http://f1l3download.site/playstation_2_games_free_full_versioncspeq.pdfIn PDF document text
    • http://cashbackmoney.info/best_cell_phone_for_hearing_impaired_verizon4p876.pdfIn PDF document text
    • http://milansit.space/nizoxoxanizepekebijibotudgppio.pdfIn PDF document text
    • http://pavogireb.22web.org/fupev.pdfIn PDF document text
    • http://biggymstoe.com/sig_sauer_p226_9mm_recoil_spring_weightp2had.pdfIn PDF document text
    • http://fruktovik.com/10894920283vwiwc.pdfIn PDF document text
    • http://gidpopiteru.com/how_to_have_good_speaking_skillss61ny.pdfIn PDF document text
    • http://summ-ita.space/zolupumokipuwetiza2jdx2.pdfIn PDF document text
    • http://ulekschool.online/karthun_lands_of_conflict_downloadsq5uf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xelimewat/small_baby_boy_images.pdfIn PDF document text
    • http://gonazanuta.epizy.com/overlord_light_novel_volume_14_chapter_4_part_12.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/juxowemuwaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae21d7f-c158-48d1-8bb3-a12fbbb755cd/52040608981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/650a3698-c6a0-4397-9f11-b86a8352ada1/sat_test_preparation_classes_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f099cd77-e582-4c75-a3e2-1d2c31b90e49/snugride_30_vs_30_lx.pdfIn PDF document text
    • http://fexewon.rf.gd/flight_radar_app_for_android.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 5248 bytes
SHA-256: bc7eb904f418a215e81a07b0c114b96596157e7cdfc9134fb66ea75ede3752dd
font_01_sfnt_off00010316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10316 11272 bytes
SHA-256: c1cb49c514b84cda7db9b5c09aa1919b469194bf384ad48a17ffc1c7ba27318f

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