PDF malware analysis — malicious · 3f6f3aa8d4e540f6

MALICIOUS

PDF

89.0 KB Created: 2021-04-17 10:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21

MD5: 698a1ea816ba15b3daccd53c99be137e SHA-1: 24db13b5575196c6ce216677320b7684fe2f8e7c SHA-256: 3f6f3aa8d4e540f6b3953e8c891e77eb2c6a6f3687968223e6171e3b0600e4aa

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a high concentration on disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to "classroom management strategies ppt", indicating a phishing pretext.

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://xezojetit.ru/strik?utm_term=classroom+management+strategies+ppt PDF link annotation
- https://static.s123-cdn-static.com/uploads/4408987/normal_5ff0086ee3463.pdfIn PDF document text
- http://kujotisokuvo.iblogger.org/nusexejewizox.pdfIn PDF document text
- https://xefakebeka.weebly.com/uploads/1/3/5/9/135993821/pakasub.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4408172/normal_605322eeba885.pdfIn PDF document text
- https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/8940625.pdfIn PDF document text
- https://popetufuwude.weebly.com/uploads/1/3/1/4/131483025/tegibikabikos.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4371020/normal_5fce7112ea923.pdfIn PDF document text
- http://losiruwu.66ghz.com/information_about_invention_of_telephone_in_marathi.pdfIn PDF document text
- http://vibolofisef.mywebcommunity.org/pigimipujewa.pdfIn PDF document text
- https://fezagigix.weebly.com/uploads/1/3/0/8/130813643/parilapo_feligifujuner_laliwezil.pdfIn PDF document text
- https://rigawegafo.weebly.com/uploads/1/3/4/5/134587157/naleme.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
- http://jalameki.epizy.com/sijasedopikofiratu.pdfIn PDF document text
- http://varoxekoduv.epizy.com/joberunisepejolek.pdfIn PDF document text
- http://koxigumom.onlinewebshop.net/34131890036.pdfIn PDF document text
- https://s3.amazonaws.com/jalasilunaz/metodologia_auditoria_de_sistemas_informaticos.pdfIn PDF document text
- https://s3.amazonaws.com/bogijexu/temas_para_estudios_biblicos_catolicos.pdfIn PDF document text
- http://tesoxukezeziles.epizy.com/62591108602.pdfIn PDF document text
- https://s3.amazonaws.com/muvazi/mawivaweratagesuvopazo.pdfIn PDF document text
- http://kuwexugebukutim.rf.gd/autodesk_dwg_trueview_2020_tutorial.pdfIn PDF document text
- http://tevizowubutek.rf.gd/jomizipugidinexe.pdfIn PDF document text
- http://zalatikewal.atwebpages.com/categories_of_system_software.pdfIn PDF document text
- https://s3.amazonaws.com/lebejos/93287418189.pdfIn PDF document text
- https://s3.amazonaws.com/setikizo/pozeror.pdfIn PDF document text
- http://povumuvepu.epizy.com/erased_anime_imdb_parents_guide.pdfIn PDF document text
- http://pavadujutupa.epizy.com/how_to_use_boss_gt_1000.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.

Filename	Kind	Source	Size
`font_00_sfnt_off000110c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110C0	4948 bytes
SHA-256: `e712a91144825efd648c79dc4b4f9d218d49cda7343186f88e72cb4bb14656fd`
`font_01_sfnt_off00012176.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12176	11340 bytes
SHA-256: `0d3dd221e3b3420804a663f7f9023d733adabf531014b6e77be46d64de1b3fb2`
`font_02_sfnt_off00014814.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14814	4324 bytes
SHA-256: `9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2`

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