Malicious PDF — malware analysis report

Static analysis result for SHA-256 271b415d4a7f5854…

MALICIOUS

PDF

74.8 KB Created: 2021-06-08 10:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 266556d2580af9fefdb4a15ef9646b0d SHA-1: ee240f8a7f3768fe49a0da6766562a78af331d95 SHA-256: 271b415d4a7f58547f2c4eda09dabb34e66685e75041b4d33fd75aff36c2ef71
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The document body, though heavily obfuscated, contains text related to 'primary apportionment of overheads' and is generated by wkhtmltopdf, suggesting a lure to a website. The primary IOC is the external URI pointing to a suspicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/pbw?utm_term=what+is+primary+apportionment+of+overheads PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418188/normal_605c08d6ae975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_5fdc2b0b6e088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485810/normal_5fdb0b4b92243.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://degenazi.pbworks.com/f/msp_cheats_2021.pdfIn PDF document text
    • http://sujagajo.pbworks.com/f/120877339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df33346-b2a2-4e76-a310-738abf7e44ed/cules_son_los_dolores_ms_comunes_en_el_embarazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b7c1a15-84cd-4586-aafb-03dc77260847/dayton_battery_charger_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b265d8-7f4b-4d88-aa94-d04065072dc1/91154666589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c8a5541-9385-4a80-8ec8-bfc45cf7996d/mumeligobujimitotakefi.pdfIn PDF document text
    • http://rupebaxo.pbworks.com/f/what_does_the_death_head_moth_represent.pdfIn PDF document text
    • http://nolumemonip.pbworks.com/f/download_lagu_naruto_blue_bird_ikimono_gakari_mp3.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/w/file/fetch/144469887/buxubitagon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a4b0236-8ebd-429f-a2ea-0ea93444d99a/rukes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3c9b4d8-4777-4fd7-bf83-93eaca0d37f7/35987655552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c594bf-c6b2-46f8-8676-1f312b8f997f/jeg_vil_bede_for_dig_gaithers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b09222d-b258-4b08-a92d-97eeabcb974d/que_come_el_oso_de_anteojos_y_donde_vive.pdfIn PDF document text
    • http://zeratuwolima.pbworks.com/w/file/fetch/144537069/how_to_get_shopping_basket_analysis_in_excel.pdfIn PDF document text
    • http://muzupusap.pbworks.com/w/file/fetch/144596874/7194329037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/441d9050-c42e-4445-a0d5-3dd231ebc508/basurotevezovon.pdfIn PDF document text
    • http://dawanitapix.pbworks.com/f/xiruxosobemu.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/w/file/fetch/144569595/xowonogotopobusunipupovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f502477a-09e4-4e35-aae6-48feaf336fe6/is_it_legal_to_flip_houses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/182ec4ba-1bc0-47ae-a0b5-a5deb3aed170/how_to_draw_a_person_full_body_girl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7056c3d0-4acc-4534-b6a7-53b80bd54eee/xominolafofawupiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67785635-eac4-4b19-aecb-c5f465afe1fd/how_to_unfriend_multiple_friends_on_facebook_on_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73733378-f069-4357-85f3-d2aef8b249e5/suxazokezodotazigaza.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_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 5424 bytes
SHA-256: 83fafd3413eb07d1542e06463a2b2593efad9dadd0e8d52d8ab4521fa58154f5
font_01_sfnt_off0000f9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AA 10488 bytes
SHA-256: 2b1cea7f327bde7baec7ecb18c700341740b7047124db3c8706da7b5a136c437

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