Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6865837556329b…

MALICIOUS

PDF

67.8 KB Created: 2021-03-08 22:08:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 72be2e20a671b9f332d76bd6b17af4c7 SHA-1: 29e6d1b91ce20536b2a84d82295c5b2ab9a86c2a SHA-256: da6865837556329bd8657f16f79fc8a1deff1011dd577fb705247b66ea9bdacb
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains multiple external URIs, with one prominent URL being `https://pelibifir.ru/123?utm_term=presonus+bluetube+dual+path+manual`, suggesting a phishing lure related to a product manual. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

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 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://pelibifir.ru/123?utm_term=presonus+bluetube+dual+path+manual PDF link annotation
    • http://vewikimeno.22web.org/somewhere_over_the_rainbow_judy_garland_ukulele_chords.pdfIn PDF document text
    • https://kejarokelevu.weebly.com/uploads/1/3/5/2/135297316/wuwiweti.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/cuisinart_griddler_deluxe_steak.pdfIn PDF document text
    • https://roxeviviko.weebly.com/uploads/1/3/5/3/135317288/mesuxipe-ponut-pabobedinerufol.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/1981208249.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/dazifozixawus/samsung_a70_wallpaper_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/44679352635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/042db471-9ceb-41b8-ad40-6629fd9f1ed8/88336873186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e127bfb-c4c2-4c85-b1d5-1bdbc8aa0b75/how_much_is_after_effects_cc_2020.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/how_to_brighten_up_a_dark_bedroom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53acdaaf-7c86-4d66-afee-76a015480998/15870127926.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/elasticsearch_list_index_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad7f07d-2cc4-4a1c-9e96-cfc32eb5aa62/absolute_surrender_andrew_murray_free_download.pdfIn PDF document text
    • http://kalojumigeri.rf.gd/how_to_help_a_teenager_with_time_management.pdfIn PDF document text
    • http://bidadefaj.epizy.com/42914558366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25cd86f-6333-413e-97e9-052dd26de9b3/how_to_spell_looking.pdfIn PDF document text
    • http://bujekotu.atwebpages.com/dirt_devil_upright_vacuum_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/purple_rose_wallpaper_free_for_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/35203579300.pdfIn PDF document text
    • http://loratozojakin.epizy.com/lipuxis.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_off0000ca4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4B 5340 bytes
SHA-256: 3a078e7faaa9e86773f084ce0b6982bb3140841cd8661d0e2c01bfc93881ff8a
font_01_sfnt_off0000dc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3A 11188 bytes
SHA-256: 22aeb86bed70d70c1bdd01f538b59c2f219d39974d76c9d7434ee33b18f6e85e

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