Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4377c070a94dc3…

MALICIOUS

PDF

83.7 KB Created: 2021-03-19 16:58:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f870f819d8b2793d16bf23c2fda00901 SHA-1: 1e916b8138e0582a5451e44b6e3a32ac66058ecc SHA-256: 4d4377c070a94dc382eb43dc6a7e44c3ea6699340634c67542de6e44768d7edc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to PDF files hosted on link farm domains, suggesting a phishing or SEO spam campaign. The embedded URL 'https://nipisod.ru/strik?utm_term=is+medical+billing+and+coding+hard+to+learn' indicates a lure related to educational or career topics. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=is+medical+billing+and+coding+hard+to+learn
    • https://geripipo.weebly.com/uploads/1/3/4/3/134371036/redutawopusosa_nepevevari_xugakimi_pepebevojira.pdf
    • https://cdn.sqhk.co/faroziwe/jQVjju8/jurassic_park_survival_of_the_fittest_mission.pdf
    • https://vexinafofonazes.weebly.com/uploads/1/3/1/8/131871992/mulidedogoxene.pdf
    • https://static.s123-cdn-static.com/uploads/4414864/normal_5fcdf93a22afe.pdf
    • https://jigudisite.weebly.com/uploads/1/3/4/6/134603970/sujopumedemixepob.pdf
    • https://cdn.sqhk.co/gutinisiv/hjg4Mji/watch_free_movies_online_streaming_no_registration.pdf
    • https://cdn.sqhk.co/dubezaxuviz/jiivhjo/parasitoids_behavioral_and_evolutionary_ecology.pdf
    • http://tuworiki.22web.org/busqueda_de_informacion_en_la_redaccion.pdf
    • https://cdn-cms.f-static.net/uploads/4381095/normal_60304ea397344.pdf
    • http://felezebelitex.iblogger.org/writing_intervals_music_theory_worksheet_answers.pdf
    • https://cdn.sqhk.co/pogezasamu/hiINJli/dark_forest_background_pictures.pdf
    • https://cdn-cms.f-static.net/uploads/4370319/normal_6051231bccefe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8ee4d174-735f-4cd7-9396-c3a65dbcc337.filesusr.com/ugd/5ac313_e9e1725f08e6402bba4f0484d879406d.pdf?index=true
    • https://s3.amazonaws.com/gumagabu/blade_and_soul_slow.pdf
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_bedd463a26774f53a93bc3d04bd9bd5c.pdf?index=true
    • https://s3.amazonaws.com/gulapore/mexasu.pdf
    • http://merofis.epizy.com/serologia_definicion.pdf
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_c43c527109f34f78864e6ecae3be3876.pdf?index=true
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_bc1399aabb9c4dbaa13c3b9cd307a23d.pdf?index=true
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_f6f785a64b314252be059a402d81c86e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ad.bin
7aece6d8da29fcbd0fee4a67b74ec0138548b917736f073f4cf4e508608633f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 5432 bytes
font_01_sfnt_off00011aee.bin
7e9b043333d9b9c41e3f904a2e4dd3de5c5bfa8c671e5c5a5133f3905a01d96d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEE 11396 bytes

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