Malicious PDF — malware analysis report

Static analysis result for SHA-256 c807e6f7030db2e3…

MALICIOUS

PDF

83.0 KB Created: 2021-03-26 10:20:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50f7476118250f0106cc247e8ca1e633 SHA-1: 49f951373cccb6e07da345dfec6a1abe270b4870 SHA-256: c807e6f7030db2e370e40e6db16ec7143f4d495def9b5d1fcc8ba076bb3e8e33
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM'. One of the primary URLs, 'https://dafemum.ru/123?utm_term=emt+exam+1+answers', is associated with the attack pattern. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/123?utm_term=emt+exam+1+answers
    • http://nutetuxiv.mygamesonline.org/61310174656.pdf
    • http://bobixina.getenjoyment.net/47692907978.pdf
    • https://cdn.sqhk.co/fusaduxuw/mYjbFjc/classical_piano_songs_used_in_movies.pdf
    • https://cdn.sqhk.co/zepinima/QJidheE/fajigabopatojugixeranan.pdf
    • https://cdn.sqhk.co/dalegoti/Phcaifa/ear_nose_throat_doctor_name_in_spanish.pdf
    • https://cdn.sqhk.co/fironabe/fiajagj/essential_calculus_early_transcendentals_answers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_ee5fddbbc7a841e0829e07bbd638e6aa.pdf?index=true
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_c6670d5acbd04df9bf39ca451c4a6e50.pdf?index=true
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_8d7426da6674420287d8884a2e5f92e1.pdf?index=true
    • https://s3.amazonaws.com/wurivuve/kashrut_guide_london_beth_din.pdf
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_810bafa5d2894454a3ff0e1b93d2e878.pdf?index=true
    • http://teropisarazo.myartsonline.com/aqeedah_tahawiyyah_commentary.pdf
    • http://kuzemepusiloj.onlinewebshop.net/giwinizaxafujup.pdf
    • https://s3.amazonaws.com/dobesogum/ip_subnet_calculator_boson.pdf
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_be75872576094ccbbba051760e11e97b.pdf?index=true
    • https://s3.amazonaws.com/wuvepilamamuse/driver_impressora_hp_laserjet_pro_400_color_mfp_m475dw.pdf
    • http://jafixomedimun.onlinewebshop.net/31834551200.pdf
    • https://s3.amazonaws.com/vibasujefir/ankusham_telugu_old_movie_songs_free.pdf
    • https://s3.amazonaws.com/falejogajir/49371854568.pdf
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_7575179bfdb04191a536774c83c8d428.pdf?index=true
    • https://s3.amazonaws.com/jipowumat/what_did_the_bobo_doll_study_show.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_off0000fba9.bin
f7c64dad4af236e0f3f4be2007a6148d5be13b9bf21bd97eb3fb38e407a6787f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 4596 bytes
font_01_sfnt_off00010b2b.bin
7a8b7c4679cfaeb944f01900bbb608c705120204998f0a4a8d7f4448efe9e79d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 11096 bytes
font_02_sfnt_off000130df.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130DF 4324 bytes

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