Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf59a741a6f2894…

MALICIOUS

PDF

101.1 KB Created: 2021-03-29 22:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6670bf0005729f5751a00a031492f7ef SHA-1: da9a81ed2888c8972b968ee38ec91fe71d616cef SHA-256: ecf59a741a6f2894ed29537308f8fa86b632f4d5c19a11d0bc5ff4734e3a135e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link pointing to 'baarspo.ru', suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to a malicious site, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/aws?utm_term=little+shop+of+horrors+plant+audrey
    • http://begemotiks.fun/sapna_choudhary_ke_gane_dj_pagalworldsumm0.pdf
    • http://judupebe.getenjoyment.net/cartographies_of_diaspora_contesting_identities.pdf
    • http://remont-pc.website/2228246507480957.pdf
    • http://dadevizevarek.scienceontheweb.net/biopsychology_pinel_download.pdf
    • http://zerkalo-fugicar.website/mukuvogevanefasamuvokgzfb4.pdf
    • http://uscarins.info/hornady_gmx_6.5_creedmoor_load_datazo6m6.pdf
    • http://daimontimur.org/litupitijoxosajijemnkn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xufaxoferugod/philips_norelco_5000_trimmer_manual.pdf
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_eca421260f424bf4bb9301598ae9654f.pdf?index=true
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_07b9600f7f1c447e9ae696ae76a11c63.pdf?index=true
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_71f11729cb7c4fbc9f6d1ad3fc584f7f.pdf?index=true
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_5c358a235fc34c1a90162b5fddba2e0d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9460998e-8d14-46b6-8f1a-4e1e64fecd18/pifukugakajejuvoxiwixifa.pdf
    • https://uploads.strikinglycdn.com/files/fdebb70c-6932-4b44-9038-38229b900d67/why_is_the_resting_membrane_potential_the_same_value_in_both_the_sensory_neuron_and_the_interneuron.pdf
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_0b8b5c69dab548ac841f9a5d849d8185.pdf?index=true
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_c899b3c5276f49f89ecf15d3647f8b79.pdf?index=true
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_07757eca9fbb45c9801e12fc8bf3d97c.pdf?index=true
    • https://s3.amazonaws.com/jefobexapulow/49777386306.pdf
    • https://s3.amazonaws.com/gazivemon/keithley_dmm_2000_datasheet.pdf
    • https://s3.amazonaws.com/vebogotexaf/kitaben_bahut_si_video_song_free.pdf
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_4cd79e76b936431f8e1be36a83a0d5d8.pdf?index=true
    • https://4a1fbaa0-0e67-401b-a466-96699e2e5642.filesusr.com/ugd/9647bf_2b562ee422ff4ce294add7c67bfa2fdd.pdf?index=true
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_d4d306a5e8fa48afab5cb32abdf125d5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f6c.bin
407177e3b0362df2e3c26006e05ff661cb2baaa929450da8e7bd52a36b914df0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6C 5056 bytes
font_01_sfnt_off00015096.bin
3292c15b8a0abb217dc12233acef54fa16d2b94d6bf0c5348762c2297a1233b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15096 11792 bytes
font_02_sfnt_off00017875.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17875 4324 bytes

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