Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae401e925897e315…

MALICIOUS

PDF

84.8 KB Created: 2021-04-29 10:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fb7f2f21e83d5810f90e89d3c1a20986 SHA-1: 56f412750d463b7abed0beacdb367800b472f17a SHA-256: ae401e925897e3158021b19cd0d9bfad1a9f71536473ba328e88592b55498689
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many of which point to benign-looking PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://golowaki.ru/strik?utm_term=oster+personal+blender+smoothie+recipes PDF link annotation
    • https://virobejiku.weebly.com/uploads/1/3/5/3/135324848/3949aaa55.pdfIn PDF document text
    • http://modebedunizux.iblogger.org/bunny_nose_and_mouth_template.pdfIn PDF document text
    • https://kewojifusufiw.weebly.com/uploads/1/3/4/6/134662328/nulunowisol-fexiwafizoleno-xuxabewa-geledodonedez.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://uploads.strikinglycdn.com/files/b528fe6b-42c8-4890-91b7-a8243395fe44/bmw_navigator_vi_owners_manual.pdfIn PDF document text
    • http://turixupifebut.epizy.com/what_do_the_symbols_on_animal_crossing_amiibo_cards_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/file_format_avchd_vs_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/segerimikulelokivira.pdfIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_3dcf9f2f46714f43920fa15f1624d0e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/debiwelof/crunchyroll_pc_app.pdfIn PDF document text
    • http://siromalezevupag.rf.gd/didagobifeluworizatu.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_7b19924a4535431cbf27b5b71d54b1d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/18702234512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9652487f-242b-41d3-8d9a-06d01f207a4a/what_is_academic_conventions.pdfIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_e5a604b9f0b04587a615c0aaed4f567c.pdf?index=trueIn PDF document text
    • http://vogidefoxafubis.epizy.com/sheet_street_towel_rack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/601f6d59-95a3-4cb1-970c-ea94f0e4d9bd/is_the_intruder_playing_on_netflix.pdfIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_d943fbcef09e4933a2cd99af3eb07131.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b6ca13e-14c6-48c9-8d79-68eab10c7d14/waterpik_cordless_plus_water_flosser_wp-450_reviews.pdfIn PDF document text
    • https://d0f5cf02-e55f-42e7-ba97-8a4d5a2b8368.filesusr.com/ugd/7f59a0_06724310218f440683e39be839c74a35.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF94 5268 bytes
SHA-256: 8dbb98c114816a2c7d4136724f4811fe23fa571b40fade2d406ac78d7d93bccf
font_01_sfnt_off0001113a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113A 10840 bytes
SHA-256: c224b996526932f1f8ac83768fa9040b6a1ba553b36df0a2d3da4556d4236e61
font_02_sfnt_off00013626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13626 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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