Malicious PDF — malware analysis report

Static analysis result for SHA-256 250b620f635960ee…

MALICIOUS

PDF

79.2 KB Created: 2021-04-07 02:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ebf57b7bf224f4c135dad675e16c10e8 SHA-1: 7472836a2b85cf44ddc04d05c280a3f5ea6d25b0 SHA-256: 250b620f635960ee24c9c6d259c9c29908b24748083e48bbb77e5a7f7ecf2b0f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://nipisod.ru/award?keyword=anhidrosis+treatment+pdf PDF link annotation
    • http://c-advance.space/berkeley_physics_coursex5qg3.pdfIn PDF document text
    • http://new-volosi.ru/weather_and_seasons_worksheets_for_grade_1x9b2n.pdfIn PDF document text
    • http://copyright-notice-ig.com/poulan_1.5_hp_electric_chainsaw_tighten_chainwx7u2.pdfIn PDF document text
    • http://meinekarten.best/lufofixsaxl2.pdfIn PDF document text
    • https://vetenejoxo.weebly.com/uploads/1/3/1/3/131379321/gometopukas.pdfIn PDF document text
    • http://bezprovodov.guru/panasonic_kx_tg9331t_problemsikl6o.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/6271306.pdfIn PDF document text
    • http://save50it.info/fundamentals_of_english_grammar_4th_edition_downloadryod9.pdfIn PDF document text
    • https://tuxibefogeja.weebly.com/uploads/1/3/4/3/134359070/dowokosepanevodem.pdfIn PDF document text
    • http://50offshop.info/the_landlady_analysis_assignment_answer_keyvc23y.pdfIn PDF document text
    • https://boferisavupase.weebly.com/uploads/1/3/1/3/131384298/2063355.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea4571e-f7cd-4e0a-9156-33e39891ce2b/renewed_hope_ranch_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d098d39e-9aba-4a5b-a7a2-78f44d666f17/viktor_frankl_mans_search_for_meaning_amazon_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ddd6999-50f2-43d4-8bd4-c1c9b8dfc631/metodologia_dela_investigacion_cientifica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e698ee-97f4-467e-8c02-1063d67d24e5/84849495219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83088f4f-4cec-40fc-9e17-99f5dcdee345/othello_act_1_scene_1_explanation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac12adf8-1aef-4adb-b182-aa844b38e230/22340069259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e41f4225-dda5-4216-b109-1454fda423c2/todibifomiwobineliluwuzos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0635535c-909e-47bc-aac1-fee5d3bb88c7/editable_savable_dnd_next_character_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/020c30e3-89b1-4b7d-a8c7-70f871aac6f8/how_to_make_friends_with_street_dogs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a8c31c-c724-42ff-8d44-e28b821c3194/xifevibovowanefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/065ffd09-d56a-4163-9d02-4cd6b516b46b/casio_g-shock_ga100-1a1cr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f0589b0-6ac5-4d7a-80a6-42a25280efdd/kekovenixemejemipejeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/758798b0-470d-4e4a-87a9-f5372229d7c9/93976482407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b3827b5-debd-4878-94f0-2216890baaec/2002_isuzu_rodeo_repair_manual.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 5240 bytes
SHA-256: 7d79084118fe152a3d594ca536de2c7bc244d78dfd1aa33baa0288aa616af0db
font_01_sfnt_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 11148 bytes
SHA-256: 3e712205db7f11de588f7cdf457559f92a4fda242b8c8ebf8baff0a5da28e7d1