Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10f7c08400371aa…

MALICIOUS

PDF

71.4 KB Created: 2021-03-18 12:14:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3c89a9aa4a42325eb0ca0ba336ce545c SHA-1: 8b090226e82fea4775e515fce6d3c35826b653dc SHA-256: d10f7c08400371aa4987de606e4671d4dbdf5286d052d2c96c88571caceb5ec1
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious or disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the phishing/malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/award?keyword=biblia+ortodoxa+vechiul+testament+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416930/normal_602589ea10076.pdfIn PDF document text
    • http://electriccannoz.club/tulisujanokajubetimorigeg52t2b.pdfIn PDF document text
    • http://a-trvl.ru/how_to_know_if_youre_working_out_too_muchkfxds.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/86103658909ls8b2.pdfIn PDF document text
    • https://dirotazu.weebly.com/uploads/1/3/1/0/131070105/3140016.pdfIn PDF document text
    • http://mavaxur.mywebcommunity.org/riluligobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424027/normal_604b3734edeed.pdfIn PDF document text
    • http://nigma24invest.online/try_not_to_laugh_challenge_markiplier_15qxhu0.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/nissan_sentra_2015_service_manual.pdfIn PDF document text
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/3628754.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/872163577695cr64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465144/normal_604191a6709d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379839/normal_5ff61209f309e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384460/normal_6007ff25d0918.pdfIn PDF document text
    • https://xakuwije.weebly.com/uploads/1/3/4/3/134340554/6020058.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/ramunigaraburazudam.pdfIn PDF document text
    • https://tuzuratodaf.weebly.com/uploads/1/3/0/7/130738639/julim.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/99709750094.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xasagode.myartsonline.com/como_calcular_distribucion_normal_estandar_en_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b631de-5add-42a7-93ce-b095b5965232/craftsman_88173_review.pdfIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_52c5111d84db4f378ab20dfa36b469cc.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_1bddf1a0cbb44b878b1fba48bb4cb838.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ff75a9-b1b8-42be-bdde-9771c7fd90a8/flowers_for_algernon_original_book_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1841593-161e-4d02-9218-11be426672ab/excel_chart_template_extension.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b8630e5-6188-4995-a651-832d57355dee/a_non_random_walk_down_wall_street_summary.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_off0000d6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D2 5712 bytes
SHA-256: fa9826602867ea53829e27bed6a1f4cba2abd35438c1b149c40b0a33637d6673
font_01_sfnt_off0000ea18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 11080 bytes
SHA-256: 7e405f836e856237f2827b15b430963f29b253a1229bc2747d8e6f5329859022