Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26ebe22b0be1a7c…

MALICIOUS

PDF

95.1 KB Created: 2021-03-14 02:08:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c84e477b2e9ea03d824807d13c58a79d SHA-1: b180b4f0b89a65a0813835e09638d40fad16deae SHA-256: c26ebe22b0be1a7c275b5db408673ff2b0189c1d9a48ea702866c3916860e64f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various domains, suggesting an attempt to manipulate search engine results or direct users to potentially malicious sites. The ML classifier and ClamAV detection further support the malicious nature of this file, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/strik?utm_term=hero4+silver+manual PDF link annotation
    • http://xemokajoled.medianewsonline.com/alimentos_para_diabeticos_tipo_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_60442ec5af128.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452865/normal_5fdea6b0d77c2.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/hjiMbjh/national_train_your_brain_day_images.pdfIn PDF document text
    • https://cdn.sqhk.co/rulopojuna/ynM6jbL/tigunuxexaw.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/cMibYgi/moruzefizikumes.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/GWZ9giU/87690102953.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393904/normal_5fddf50c3c6fd.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/fffiahh/xekibegisaduse.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/KibWeGt/lucky_draw_online_games_drawbuy._co.pdfIn PDF document text
    • https://cdn.sqhk.co/gujipiror/wOFjegg/dead_space___app_store.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406812/normal_600174b139a98.pdfIn PDF document text
    • https://cdn.sqhk.co/buzivafulet/gWgjhg7/slotocash_bonus_codes_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481999/normal_603be7218847c.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
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_224430dd51ed428c943d485719fc54d8.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_cc88143c1d7c475f91675717db5811b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64622364-c3a8-47e9-8ec9-769167b202c0/honeywell_thermostat_display_not_working_after_battery_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a05cc01-18fe-49fd-9a97-04669054145d/britax_first_class_plus_car_seat_installation_video.pdfIn PDF document text
    • http://bavatesivo.myartsonline.com/how_to_fly_a_sky_rover_outlaw.pdfIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_e72ab5f1634e4953ac1448c54f0d93fd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f19b1118-d161-46ca-a028-6b3d7bdc8703/39307132413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f52d8824-853f-4db4-8abe-da123099ea52/85340816464.pdfIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_c57d12411569446eaeae0fec2a37b88a.pdf?index=trueIn 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_off0001248f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248F 4740 bytes
SHA-256: e73839c2b5a1ff3627c7d67f045f8d31760e47cd353c685511b9210da282ab37
font_01_sfnt_off0001348a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348A 13592 bytes
SHA-256: de6cc045f454452e0143c0146fb5d01122d68c887e45e81005a5a4d8d5367636
font_02_sfnt_off00015fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB8 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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