PDF malware analysis — malicious · b0a9a0f39cfd834d

MALICIOUS

PDF

78.3 KB Created: 2021-04-10 14:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 71c1bb2ecbd463d5cd1226f7326fbe30 SHA-1: 554f15cbc7b6a1ef6d305c5cfecfdd21683686cf SHA-256: b0a9a0f39cfd834d2ffb1243c62519ca63b1a724a603f4dde60ca148ae655663

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this assessment. No scripts were extracted, but the overall structure points to an attempt to redirect users to potentially harmful external 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://pelibifir.ru/strik?utm_term=harmony+hub+always+red PDF link annotation
- https://zadopuvaja.weebly.com/uploads/1/3/4/8/134892734/fazidinar.pdfIn PDF document text
- https://vimitorumu.weebly.com/uploads/1/3/0/8/130814921/wusofugituvuzun.pdfIn PDF document text
- https://guzovadolo.weebly.com/uploads/1/3/1/6/131606502/vobusagazezun_zorepesub_ripunarivivi_jitevoro.pdfIn PDF document text
- https://cdn.sqhk.co/piwizogir/gfnhgz9/fifobukixajox.pdfIn PDF document text
- https://vopilejuwe.weebly.com/uploads/1/3/1/4/131407469/eb23418e4da1.pdfIn PDF document text
- https://lonupuvajofova.weebly.com/uploads/1/3/4/3/134341927/8807399.pdfIn PDF document text
- https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/3ff8ab94e0.pdfIn PDF document text
- https://naratejog.weebly.com/uploads/1/3/2/6/132682615/01f05728.pdfIn PDF document text
- https://cdn.sqhk.co/lirotigi/GVlU1if/wekivirokakerutolatozujex.pdfIn PDF document text
- http://bipogumaguwe.22web.org/rifibefekojeko.pdfIn PDF document text
- https://cdn.sqhk.co/tukawezezo/aiihgr3/84370155926.pdfIn PDF document text
- http://zamowisagus.22web.org/nipobi.pdfIn PDF document text
- http://gozatelaji.22web.org/algebra_tiles_practice_worksheets.pdfIn PDF document text
- http://tibudirowe.mygamesonline.org/sipamuduvumawi.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://fabonejane.onlinewebshop.net/advantages_of_quantitative_data_analysis.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/770fd1b9-b029-407c-8439-a5a347247099/how_can_i_tell_how_old_my_whirlpool_water_heater_is.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/8ad3cdcf-9ac5-4ba2-ab76-87dce5b427d4/29699797071.pdfIn PDF document text
- http://bavubuseji.epizy.com/lara_child_care_forms_michigan.pdfIn PDF document text
- http://kofipazefoleris.epizy.com/sukabutitadedasamuvejate.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_off0000e790.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE790	5112 bytes
SHA-256: `be867584c2c2216a6323ae833bb8128bcd7d9ba1ac0420c3a2c69f984dd15182`
`font_01_sfnt_off0000f8be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8BE	10488 bytes
SHA-256: `4b3021a54ac1c873d25473c586da5c496955440ca812102e39703752b1531e32`
`font_02_sfnt_off00011c77.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C77	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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