Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e3f2a71891a6b7…

MALICIOUS

PDF

72.9 KB Created: 2021-03-17 23:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cd1f4d8fa7e1a64ab8d01cd802a992b SHA-1: 2c2d53209bd623f289daa99cb672dabf8ae00cc6 SHA-256: 65e3f2a71891a6b7aa39d0c754ba07656e9fca9b265834033956db2db2d656dc
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are SEO-optimized and point to potentially malicious domains like 'soxebez.ru' and 'islemleriniz.org'. The PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a link farm, a common tactic for phishing or distributing further malware. No scripts were extracted, but the presence of numerous external links suggests an intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/award?keyword=kesavan+functional+analysis+pdf
    • http://islemleriniz.org/how_many_calories_in_chick_fil_a_southwest_salad_with_dressing77wet.pdf
    • http://nely.xyz/direction_worksheets_for_grade_3wxgta.pdf
    • https://funofumid.weebly.com/uploads/1/3/4/8/134886651/mozafukajonifa.pdf
    • http://ketotreno.buzz/diary_of_a_wimpy_kid_movie_diary_book_read_onlinetn24e.pdf
    • https://rodinesupogoj.weebly.com/uploads/1/3/1/3/131384539/jusif_zafusurox_xasiz.pdf
    • http://lastasked.com/english_as_a_second_language_teacher_resumeqavqx.pdf
    • https://tezubowaxax.weebly.com/uploads/1/3/4/6/134640868/3513935.pdf
    • http://noncomform.space/hamilton_beach_flexbrew_2_way_coffee_maker_model_49976megbc.pdf
    • http://rizaloripejo.iblogger.org/18326830991.pdf
    • https://nupimixek.weebly.com/uploads/1/3/2/7/132712066/xevezubudaba_kosov.pdf
    • http://reduslimitaly-official.site/127964884429tb78.pdf
    • https://wodorolijuzawex.weebly.com/uploads/1/3/4/7/134770742/1993642.pdf
    • http://micrometerdigital.xyz/919704295243awtj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/biwuwukesazef/topology_and_its_applications.pdf
    • https://s3.amazonaws.com/donake/android_like_iphone_x.pdf
    • https://s3.amazonaws.com/nupotukig/bomirizipovorazorilaxapug.pdf
    • https://s3.amazonaws.com/samopakamefap/lesisutiposibekemurola.pdf
    • https://s3.amazonaws.com/xewamejixolefaj/balmain_jeans_lil_yachty.pdf
    • https://s3.amazonaws.com/gadumagabusodel/rumumamutukadenar.pdf
    • https://s3.amazonaws.com/tedowafomaru/how_to_clean_the_bissell_spot_clean.pdf
    • http://puwawetodu.rf.gd/oraciones_cristianas_de_guerra_espiritual_por_los_hijos.pdf
    • http://xawugosoxule.rf.gd/somavadolawiw.pdf
    • http://gaxosinuda.rf.gd/mikarudetixuzoxojeselew.pdf
    • http://palomidifigur.epizy.com/73145063197.pdf
    • https://s3.amazonaws.com/fopalew/stihl_gas_trimmers_prices.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d42d.bin
e822af2d057732df53a53fc52ed959f98780aa2d4d33e9f8db9fb22866d21fdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD42D 5068 bytes
font_01_sfnt_off0000e58b.bin
325f9b6dbbaba060de8e0d507ee164d1a17e99a57c5e5238b0f08c888afb7843		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 10036 bytes
font_02_sfnt_off00010801.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 4324 bytes

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