Malicious PDF — malware analysis report

Static analysis result for SHA-256 863ac81284fb3430…

MALICIOUS

PDF

88.7 KB Created: 2021-04-09 02:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 234ea66035d13948cf2041630a4aeef2 SHA-1: cf89a7615a8fd49987509c1524be0cd6db6875bc SHA-256: 863ac81284fb34306e6e22a1eab0e6840a59b513445b24b3026a799966cad591
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to Weebly and S3 domains, suggesting a link farm or redirection strategy. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://midufefew.ru/strik?utm_term=act+4+the+crucible+discussion+questions PDF link annotation
    • https://kutufexefe.weebly.com/uploads/1/3/4/6/134695169/8b46c.pdfIn PDF document text
    • https://totuseki.weebly.com/uploads/1/3/5/3/135322554/2568978.pdfIn PDF document text
    • https://dalosetog.weebly.com/uploads/1/3/1/4/131412235/sopibu-mukabigojara.pdfIn PDF document text
    • https://jifalutisapore.weebly.com/uploads/1/3/4/7/134772579/baxine-lovofukesefesa.pdfIn PDF document text
    • https://foziwumiwogesis.weebly.com/uploads/1/3/5/3/135321673/6dd530.pdfIn PDF document text
    • https://lakupofudeb.weebly.com/uploads/1/3/0/7/130775354/1250279.pdfIn PDF document text
    • https://gofuzuxelizexo.weebly.com/uploads/1/3/5/3/135391542/babafepu-daratimikevolo.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/veledabejufi/kirimodulasi.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/94938059836.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/17867906361.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/wununekujorijuxevotuguri.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/baganiya_song_asomi._in.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/apk_auto_ram_booster_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/what_is_the_price_of_mini_projector.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0828603a-b0d2-46d5-8399-8e48d9191e14/matlab_polar_plot_marker_size.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/butogivikeliwijolelimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/233fc1d0-263c-4650-aaaa-1d38f46967e4/42041073842.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/ambasamuthiram_ambani_film_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/when_an_elderly_parent_is_abusive.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/nokia_android_hard_reset_code.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_off0001208f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 5160 bytes
SHA-256: d359957a778a6250ba566577cb636cc8334b1a71222d4e975087495b5dabca55
font_01_sfnt_off00013214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13214 10448 bytes
SHA-256: 11de96cf323e470286a256d66d506ff82cb167e02f4a827a4b538a12f63f23e9

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