Malicious PDF — malware analysis report

Static analysis result for SHA-256 a515e1445e03b6df…

MALICIOUS

PDF

70.3 KB Created: 2021-06-14 11:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cff99886ddd248579bc119c9a0755c2d SHA-1: 6adf15d7ebf34243523ed47470f9a75fe9a8340f SHA-256: a515e1445e03b6df8b945829c275f727bed8a6ca56f169eaf9e39b5eb364cba9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting and link farm patterns, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging social engineering to direct users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://irlanc.ru/pbw?utm_term=toad+db2+freeware PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418558/normal_5fe22ad973af4.pdfIn PDF document text
    • https://giwafadewixagi.weebly.com/uploads/1/3/4/3/134369241/4562d4c15.pdfIn PDF document text
    • https://divopugizupuja.weebly.com/uploads/1/3/4/4/134487222/5324eadf.pdfIn PDF document text
    • https://visegiwizokin.weebly.com/uploads/1/3/4/7/134721612/ee3e93f2cb1aa40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454042/normal_6059a1fe20eac.pdfIn PDF document text
    • https://kowedeta.weebly.com/uploads/1/3/0/7/130775164/5bf02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467581/normal_5ff11cb01812d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423430/normal_604874905d53e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_604f034383de5.pdfIn PDF document text
    • https://wiwetone.weebly.com/uploads/1/3/4/6/134660192/7177168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424043/normal_603599aa16608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487894/normal_602745d546c3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vinivat.pbworks.com/w/file/fetch/144649215/how_do_abiotic_factors_affect_biotic_factors_in_an_environment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5050386-b9df-4c65-8544-af4d4c667369/favuluwoz.pdfIn PDF document text
    • http://jutopar.pbworks.com/f/mods_for_minecraft_pe_furniture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c18ea9-1556-469e-80ae-0292f727a2ef/98533459763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb06bbbd-1f13-415f-8065-4e04a8e0893a/29760606593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8ffd4df-c025-40fc-9e80-111208161b36/evenflo_tribute_lx_convertible_car_seat_cup_holder.pdfIn PDF document text
    • http://buxozobodu.pbworks.com/f/tere_naal_mp3_song_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82dfb4c2-2160-4142-a6dc-d04d0ca8d4c8/what_oil_can_replace_castor_oil.pdfIn PDF document text
    • http://zezupagijene.pbworks.com/w/file/fetch/144602484/ffg_allies_and_adversaries.pdfIn PDF document text
    • http://febigadeviti.pbworks.com/w/file/fetch/145113018/zovozegodufolutoro.pdfIn PDF document text
    • http://wemekojezum.pbworks.com/w/file/fetch/145028781/38066666336.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_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 5004 bytes
SHA-256: cc19860b298a11dac49e876c67ded58e99624b321e2d583020f85e172c868176
font_01_sfnt_off0000e60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 10748 bytes
SHA-256: c4cbca45693c073346029893d85634884bd2f73082b9ee5f10f55ecbeb872b53