Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ea30fffdee7529…

MALICIOUS

PDF

114.2 KB Created: 2021-03-12 21:36:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 85998d5bed21e4e3b6a1499b9688553b SHA-1: f6ec8848f56dd45bac64a94de28311ff5bcf61f8 SHA-256: 83ea30fffdee752922678d8159e4ecc6278b3a1c3abd0580595efb784090cf46
126 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs, including one pointing to 'mezovuduw.ru', which is flagged as a potential phishing or malware distribution site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mezovuduw.ru/award?keyword=chinese+chess+strategy+pdf PDF link annotation
    • http://pixelbarista.com/44394766851igxvn.pdfIn PDF document text
    • https://manabaxijex.weebly.com/uploads/1/3/4/6/134626004/guruburu.pdfIn PDF document text
    • http://xajaweronasuxo.22web.org/zimaguvoz.pdfIn PDF document text
    • http://getne.xyz/ibps_guide_gktfhv9.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/social_behavior_mapping_activities.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453721/normal_604063e701be2.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/irobot_roomba_i4_4150_vs_67565elo.pdfIn PDF document text
    • http://paypallsecurity.com/xilokigigafizobbw8.pdfIn PDF document text
    • https://didilajuti.weebly.com/uploads/1/3/4/5/134585724/1364601.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456378/normal_6008cf3411c9a.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/78743978149.pdfIn PDF document text
    • http://kapabifidi.sportsontheweb.net/swot_analysis_mcdonalds.pdfIn PDF document text
    • http://zoomita.space/962356208032nuhv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446642/normal_60252fc532f98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486987/normal_603347995af35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486550/normal_6044a08ef1a18.pdfIn PDF document text
    • http://beritox.medianewsonline.com/oster_bread_machine_parts_model_5838.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://uploads.strikinglycdn.com/files/0d5835ae-4ac5-4b0e-b7b5-aa603b3612db/gazilulojimelopaposowab.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/clear_sky_chart_android_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80775477-9ce7-4d68-9a24-3cf4faed048d/favivuvurutepomefaxoranas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d63c95-5e93-4194-9cd6-6c784c5948e5/quotes_from_wayne_dyer.pdfIn PDF document text
    • http://gefuxexo.epizy.com/54785889100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee801620-9032-4797-adf6-f6a13396d45a/93115188454.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B32 18912 bytes
SHA-256: 3e107ea1db8cf9f31a8bc637c6d30dbd50029c5ea58a53cad55775af8d4fd384
font_01_sfnt_off00017675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17675 5188 bytes
SHA-256: abc1ee9f245d33a18b8a71dc9a9ba98a812f5eac5ef616c5ba83d6ed34b23054
font_02_sfnt_off00018811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18811 11304 bytes
SHA-256: 347fe6c69a8be6de9971257f06f7ac925cb564608c3611d2f9906b7880278572
font_03_sfnt_off0001acd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACD6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378