PDF malware analysis — malicious · 5226e30728a152de

MALICIOUS

PDF

78.0 KB Created: 2021-03-28 02:58:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 3457c426fa882bb34d2cfa8c4c0efdc0 SHA-1: 7e791b31e8bd60138a4a9b37968cd9b418a4c524 SHA-256: 5226e30728a152dea263e45f74ca436868c367f5a4316e181f21fb2549077fb6

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though truncated and obfuscated, mentions 'brother printer installer', aligning with the heuristic findings of a link farm designed to lure users to potentially malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=brother+printer+installer+dcp-+t710w+free PDF link annotation
- https://boliminukedakos.weebly.com/uploads/1/3/4/4/134494229/zufizijuvasomo.pdfIn PDF document text
- https://cdn.sqhk.co/bisuligiga/cibdP3m/precision_audio_mayfield.pdfIn PDF document text
- https://cdn.sqhk.co/denepepunuja/agfMqic/33913512074.pdfIn PDF document text
- https://cdn.sqhk.co/kumotuxijufu/js8VgcQ/ruguwele.pdfIn PDF document text
- https://paxogusav.weebly.com/uploads/1/3/4/0/134040839/mamato.pdfIn PDF document text
- https://cdn.sqhk.co/rogolafu/iihhfic/28737379015.pdfIn PDF document text
- https://pufedoxavode.weebly.com/uploads/1/3/4/6/134613169/vukokoda-nobanele.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4380079/normal_60436e7446956.pdfIn PDF document text
- http://complerbnp.com/inclined_plane_analysis_answer_keyvyqhb.pdfIn PDF document text
- https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/04d43e01.pdfIn PDF document text
- http://tryici.xyz/actiontec_router_mi424wr_manualqpb5x.pdfIn PDF document text
- https://cdn.sqhk.co/nazopekujavi/ieohigg/lonogafasu.pdfIn PDF document text
- https://fewabupa.weebly.com/uploads/1/3/4/5/134584226/zivobuv.pdfIn PDF document text
- http://it50off.pro/prophylactic_antibiotics_dental_guidelines4lx1n.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4500425/normal_5ff81461cd509.pdfIn PDF document text
- http://mexicotop3.xyz/tales_of_a_fourth_grade_nothing_ar_reading_levelxxkzo.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_7ce58d11cc864e609fe71dd296b52a0b.pdf?index=trueIn PDF document text
- https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_c1181ac0d5c143578141683502daddeb.pdf?index=trueIn PDF document text
- https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_1be5d8d362324db5840c90215bf64f7f.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000da78.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA78	5692 bytes
SHA-256: `22b3242cb78cf9c5dc513ba3ff7d202f534acb69b61a39203cf02e2aea7912dc`
`font_01_sfnt_off0000edf5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDF5	11644 bytes
SHA-256: `f2868c4ebf2f32f5e823528f8a49f5f4cc721ff660297cce2cc3624c12423e9f`
`font_02_sfnt_off000115ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115CA	16092 bytes
SHA-256: `e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848`

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