PDF malware analysis — malicious · 84d44cf9a4f65ba3

MALICIOUS

PDF

78.5 KB Created: 2021-03-31 03:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16

MD5: f38eb425dc34413a2780c4b350fab41b SHA-1: da723f52602ad6d1959f7aeca2662f9a813f80a4 SHA-256: 84d44cf9a4f65ba3df6bd1c2eb75f4e62f7861a6318ba7844c109cd8f41608a1

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on low-reputation domains, likely to obscure the true malicious destination. The primary malicious URL identified is https://jumiwimov.ru/strik?utm_term=saxon+calculus+answers.

Machine Learning

Nyx PDF Classifier malicious score 0.9954

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://jumiwimov.ru/strik?utm_term=saxon+calculus+answers PDF link annotation
- https://cdn-cms.f-static.net/uploads/4387061/normal_606014e4048a9.pdfIn PDF document text
- http://muxoman.mygamesonline.org/41167961151.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4496378/normal_5fff44dfed1a7.pdfIn PDF document text
- https://cdn.sqhk.co/vefapatape/0tOiiid/graphic_arts_draughtsman_meaning.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4491412/normal_6026084800954.pdfIn PDF document text
- http://bomalemudori.iblogger.org/18367146704.pdfIn PDF document text
- http://astropsychology.website/teburevunixetiguxasakag23o4c.pdfIn PDF document text
- https://cdn.sqhk.co/pijuvedozuw/u5hbogj/mini_militia_doodle_army_2_similar_games.pdfIn PDF document text
- http://faponabon.mygamesonline.org/books_by_apostle_joshua_selman.pdfIn PDF document text
- http://lalashoppen.online/merodoxixobtkca.pdfIn PDF document text
- http://tikanaw.mypressonline.com/acids_and_bases_pogil_answer_key.pdfIn PDF document text
- https://cdn.sqhk.co/zomulusiku/gyzjfT4/mini_golf_near_nowra.pdfIn PDF document text
- http://runmasten.online/troy-bilt_bronco_automatic_42-in_riding_lawn_mower_reviewsbjxzj.pdfIn PDF document text
- http://mantenancie.com/faber_piano_adventures_level_1_audior2p3a.pdfIn PDF document text
- http://lilubaxubaxulu.sportsontheweb.net/91440462344.pdfIn PDF document text
- http://milanomoda-italy.website/mazizidopeluvuxefijosl2so.pdfIn PDF document text
- https://cdn.sqhk.co/dijadive/geihoTv/okra_project_rating.pdfIn PDF document text
- https://cdn.sqhk.co/sebutarukaw/jaPihWh/latuki.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://vedidutumi.rf.gd/52818058585.pdfIn PDF document text
- https://s3.amazonaws.com/sukobogixe/fantastic_beasts_and_where_to_find_them_2_book.pdfIn PDF document text
- http://dajasunekufa.epizy.com/viktor_frankl_mans_search_for_meaning_summary.pdfIn PDF document text
- https://s3.amazonaws.com/pusolefosex/chatrapathi_songs_free_tamil.pdfIn PDF document text
- https://s3.amazonaws.com/bugutaj/calendar_template_free_june.pdfIn PDF document text
- http://nukobis.rf.gd/65607538262.pdfIn PDF document text
- https://s3.amazonaws.com/nimuwet/3771356528.pdfIn PDF document text
- https://s3.amazonaws.com/pokorevalaxex/18150980298.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_off0000eb38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB38	2900 bytes
SHA-256: `40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306`
`font_01_sfnt_off0000f57c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF57C	5056 bytes
SHA-256: `b2ae8fbb7d553809658056c05ba4a0e574e9b9cfc985482bacdaf11524175c8c`
`font_02_sfnt_off000106cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106CC	10944 bytes
SHA-256: `4ad2f6fc7ca5f0a3cc7c05f9ac9207e4fcc753495b9797ede562fe31b21a10a1`

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