Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b7dfee75b6285f…

MALICIOUS

PDF

75.6 KB Created: 2021-03-20 17:37:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8eb1f18e4f4d7ad3c6636e647c1f0b3 SHA-1: d4dbc30b70051cbd788b13c6621dd532c2c9dae3 SHA-256: d2b7dfee75b6285f43b5e840c0c45325955bc827d158ff20df7cd467b08a8245
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. The embedded URL `https://botokaw.ru/wix?keyword=parallel+lines+worksheet+pdf` indicates a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=parallel+lines+worksheet+pdf
    • https://cdn-cms.f-static.net/uploads/4446380/normal_6030447a5c6f5.pdf
    • https://static.s123-cdn-static.com/uploads/4403938/normal_5fca2deec9100.pdf
    • https://cdn-cms.f-static.net/uploads/4417213/normal_604ca2ebc80a0.pdf
    • http://nnorm-id.com/33371677351i3kut.pdf
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/6166958.pdf
    • https://setejurisu.weebly.com/uploads/1/3/2/7/132740540/xisudomu_fagokesubilow.pdf
    • https://tedagenuv.weebly.com/uploads/1/3/2/6/132682668/wofas-gusoxibot-buzusanenose-lekepepu.pdf
    • https://cdn-cms.f-static.net/uploads/4393898/normal_604de1f89ef4e.pdf
    • https://jizexukufi.weebly.com/uploads/1/3/4/1/134109318/1651743.pdf
    • http://casser.xyz/pentair_minimax_nt_owners_manualeqc35.pdf
    • http://uose.xyz/continuidad_de_los_parques_analisis_personajesin7l0.pdf
    • https://static.s123-cdn-static.com/uploads/4386829/normal_5ff484de5b1aa.pdf
    • https://cdn-cms.f-static.net/uploads/4374980/normal_5fe856afd15ed.pdf
    • https://static.s123-cdn-static.com/uploads/4446921/normal_6004b3710fbe9.pdf
    • https://kaxawoxo.weebly.com/uploads/1/3/1/0/131070710/jozodediki_kiretefujibuk_fiwiwe_berazenikaf.pdf
    • https://cdn-cms.f-static.net/uploads/4490265/normal_6055a765339f1.pdf
    • https://cdn-cms.f-static.net/uploads/4491398/normal_6046b32d2c674.pdf
    • https://static.s123-cdn-static.com/uploads/4475376/normal_5fe44fe174160.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c68838b8-e8ad-4504-a789-5487cbd26347/what_causes_pain_in_the_crown_of_your_head.pdf
    • https://uploads.strikinglycdn.com/files/442df28e-657d-487a-8f3c-31522d934c2a/data_structures_and_algorithms_interview_questions_for_experienced.pdf
    • https://uploads.strikinglycdn.com/files/934785bf-7a51-4575-8be2-6cacb9499506/harry_potter_part_1_full_movie_in_tamil_youtube.pdf
    • https://uploads.strikinglycdn.com/files/9c98788f-a4dd-4931-9c58-741eb22586ff/wufopebabalanupo.pdf
    • https://uploads.strikinglycdn.com/files/0c8303be-8c70-441d-9266-7f2a5d66b144/how_to_use_spectra_s1_plus_pump.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deed.bin
caa9f41479b86d70594b93c2e81382e80af0e3f2b763bf65ace6e9f5478efc48
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 5288 bytes
font_01_sfnt_off0000f0ea.bin
6d6c1314b1ddc68d0ea737f3eb9353b1b3728c862eaf918143cf1ef309c17e68
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 3128 bytes
font_02_sfnt_off0000fdae.bin
b9c2ec7dd0b02a6ceb1f1fdef6741edbfb18db9b8cc591aa82428ae5b03e1eac
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 10240 bytes