Malicious PDF — malware analysis report

Static analysis result for SHA-256 954df621cd33b703…

MALICIOUS

PDF

93.3 KB Created: 2021-04-08 15:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 56ca828895035793d510f2646bca41a9 SHA-1: 59b15f0e5aa3666aaa0567bf2f6830c044fb4e7b SHA-256: 954df621cd33b7039e734cd4080204d9f70aa57ffc9e85f00cb7ea7054c2d9e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, many of which point to disposable or unknown domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to "Resistor color code 4 band pdf", likely a pretext to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://bologen.ru/strik?utm_term=resistor+color+code+4+band+pdf PDF link annotation
    • http://titanovyi-filtr.ru/1453937260126v2r.pdfIn PDF document text
    • http://mscgis.net/2413202113703dnx.pdfIn PDF document text
    • http://itsamorem.com/homedics_sc-531_manualp4kge.pdfIn PDF document text
    • http://talakam.space/videofx_music_video_maker_apkqx9pn.pdfIn PDF document text
    • http://lnstagramoriginal.com/31086040849tmqg5.pdfIn PDF document text
    • http://uscarins.info/which_is_the_best_site_to_learn_codingd5e8t.pdfIn PDF document text
    • http://cmbmarketing.agency/steve_jobs_commencement_speech_worksheet9d000.pdfIn PDF document text
    • http://capridigi.com/wonder_comprehension_questions_part_7b76lc.pdfIn PDF document text
    • http://maturibcgj.space/33370408231v9e7f.pdfIn PDF document text
    • http://habirovradik.ru/how_to_setup_celestron_nexstar_8se9myfj.pdfIn PDF document text
    • http://2220202.ru/graphic_designer_salary_nz_per_hourt614r.pdfIn PDF document text
    • http://pepirizibizedel.22web.org/google_play_store_apps_waiting_for.pdfIn PDF document text
    • http://blognews.top/54481491051o0pan.pdfIn PDF document text
    • http://micrometerdigital.xyz/netgear_jgs524_v2_poef65t8.pdfIn PDF document text
    • http://mx50off.pro/419539021969ko0q.pdfIn PDF document text
    • http://glossywp.online/how_to_get_the_cube_root_on_a_ti_30x_iis_calculatortr3mt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rinifujojutot.epizy.com/vepadamuxixorebipuputepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdda8295-0077-4b46-9bf8-faa8f038adc8/wokugimubikabun.pdfIn PDF document text
    • http://kimejuj.rf.gd/wordpress_guide_for_developers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fed8dfab-716f-48a3-8a03-d08d8d5528f6/libro_de_urantia_espaol_descargar.pdfIn PDF document text
    • http://mutabopuwulawu.rf.gd/zovus.pdfIn PDF document text
    • http://nexuxawire.epizy.com/jedimibiseravagome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/badc02d9-bdea-446b-adf7-d423da8b9f77/15400000079.pdfIn PDF document text
    • http://fanupola.epizy.com/danganronpa_2_school_mode_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 5172 bytes
SHA-256: ad028e1094addbb531803c93079d8d86e06af1fd20ad4ca699fba8ae3940821c
font_01_sfnt_off0001193d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193D 11944 bytes
SHA-256: fa793b698901f4d357f1fab286aed522bd96de3c01807989460df6bb3ce71c1b
font_02_sfnt_off0001421a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421A 16244 bytes
SHA-256: b4c568e1fbc2d93be46daf148b8e2b5cf800c5f042465160ffe849a8851ab28c
font_03_sfnt_off0001578b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1578B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f