Malicious PDF — malware analysis report

Static analysis result for SHA-256 7515f115afb695ec…

MALICIOUS

PDF

75.8 KB Created: 2021-03-22 15:09:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 391d6993dc6a4b80c35eaae8f7bdc59b SHA-1: 75d6c777a98f1d50970dae869f7132a1e947a08a SHA-256: 7515f115afb695ec3c8b239e595b021de32f9c4f27b4e8b26673747e23095b13
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to disposable hosting, and one specific URL that appears to be a lure for an Omron timer manual. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF structure suggest an attempt to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 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.
  • 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://gimoguvi.ru/aws?utm_term=omron+h3cr-a8+timer+manual PDF link annotation
    • https://cdn.sqhk.co/kataduzoni/1jdgeja/3d_rpg_games_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinipaz/ikzhcjh/98253322215.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/DggkgiN/dopabukomevudivemujuzoba.pdfIn PDF document text
    • https://cdn.sqhk.co/vosizijanad/ieKifr9/61844501583.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/heieqnr/82041355364.pdfIn PDF document text
    • http://sunshop.pro/887977481984lra7.pdfIn PDF document text
    • https://cdn.sqhk.co/lugenaru/iagihgL/career_ability_placement_survey.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/hGpcgnM/casey_kesselring_hockey_agent.pdfIn PDF document text
    • https://cdn.sqhk.co/jupozaregu/5iaijii/best_2020_bollywood_movies_on_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuputid/5Q9yTji/zulavamejivedu.pdfIn PDF document text
    • http://petersikdar.com/xofafedinusavuzupomotifesqom8g.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejeni/Didihca/82725132406.pdfIn PDF document text
    • http://vivadoctor.ru/misd_course_description_guideflv8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_d4872bcf5582421fbfcfcfb3b1856b4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zonivezada/81830814324.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_a349f41e786c423abca6490f19b6bb2a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/95424388682.pdfIn PDF document text
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_159e4d1fabb6440bab2a90e1169f2ecb.pdf?index=trueIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_8e99c882c9cf47c8b15ee88153e474dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/298f2ab8-b146-4be0-9ad7-abc37dbabe00/how_to_improve_running_strength.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6c8924e-e6cd-4a5d-814d-970e9880f821/74006923559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05967552-a3ea-4f5b-83a7-d1a4060dcd83/hebrew_new_testament.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d824a763-097e-4ff5-83ae-35ea3be33ca8/55680407826.pdfIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_db518acfb649457e8219e96d677d9701.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5943fd25-1211-4951-bdc8-f4b486a094c0/90243685592.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 5160 bytes
SHA-256: 7b470fd53703089d6d9ecadf5e68d5689c1b971df12a2ec732b282b5551bb124
font_01_sfnt_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 10500 bytes
SHA-256: e07106a2fee268c7c43cd60f912840cbddb0ed80150237a57c28379aed83c59e
font_02_sfnt_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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