Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d3379fa0aa8553…

MALICIOUS

PDF

68.3 KB Created: 2021-03-04 13:37:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 080dc5ec31c0df0653c48217a7a66f25 SHA-1: 5ce4964c6f6869f14d0d548795215277b3c2749e SHA-256: 95d3379fa0aa8553c2e510f05d406796e942ac8dbb41e64e406123071d698038
184 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, appears to contain search terms related to service manuals, suggesting a lure for phishing or a scam. The presence of multiple embedded URLs and the ClamAV detection further support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=sears+garage+door+opener+service+manual In PDF document text
    • http://in-arenas.com/inlay_router_templatesc8hhl.pdfIn PDF document text
    • http://mastericy-chistoty.ru/80907161045p5lmb.pdfIn PDF document text
    • http://itasda.online/evh_5150_iii_1x12_combo_reviewu4e47.pdfIn PDF document text
    • http://thesalle.xyz/hypertonic_hypotonic_isotonic_worksheet303n3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_5fe798f809b5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416939/normal_600b5ed75a9ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423148/normal_5fec68ec08416.pdfIn PDF document text
    • http://postel-na-zakaz.ru/dell_e207wfp_monitorbkeo4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_a120641a694643d99cf627aad58c819c.pdf?index=trueIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_1600c6f7dc354addab0d46f4bd0a7aca.pdf?index=trueIn PDF document text
    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_a6efe0c8f04c411f95f8b00bb36ecc77.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2287738-158f-49b5-bbeb-7e189eb1762f/mean_median_mode_range_standard_deviation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9047ae44-8e43-4d5b-b6aa-954a4648c12f/nefomasok.pdfIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_4e336708be3f4079bf647b16c80dd39e.pdf?index=trueIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_6a226d792eb44e8891346fe9dfb11da1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/aha_asa_stroke_guidelines.pdfIn PDF document text
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_65ea66c46cc4440fbbeb4c80fae52c82.pdf?index=trueIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_b1e64360924444aaa1c9e3a26e1a602f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/yes_we_can_song.pdfIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_a503880912ed423e874350d5a79703c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/549314c9-1778-46ca-8269-b5d29964eae6/38442304814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/167e889c-3504-4eec-8b39-abb94b3646db/tree_of_life_movie_story.pdfIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_bda787b12e1b4082a2c545fdfda09500.pdf?index=trueIn 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_off0000ceb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB2 5556 bytes
SHA-256: a20c3066fb8d0d951776ead1968aa3b0565c6f4e58196579546cf1cf1ef2de11
font_01_sfnt_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 9872 bytes
SHA-256: 347689a8e053217f852ca31204c7ba0a0cc2772d3304858ef9c75b2a693de926