PDF malware analysis — malicious · bbdb12fe2e27d192

MALICIOUS

PDF

77.5 KB Created: 2021-03-07 21:15:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22

MD5: abf278f603a938ae482d7277f3d4613a SHA-1: 2eb0fcda64c47c0a6f5d57a6f2460dd1035fb09f SHA-256: bbdb12fe2e27d192279b27201314cfd083a25e2e7b4f2cbd697eb8bd15822853

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious due to its function as a link farm, containing numerous embedded URLs that lead to potentially harmful content. Several heuristics indicate that the PDF links to known malicious redirectors and is part of a link farm hosted on disposable infrastructure, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection further support its malicious nature.

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
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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://dafemum.ru/wix?keyword=3+body+problem+pdf In PDF document text
- http://puliliraforuwu.22web.org/free_pascal_windows_7.pdfIn PDF document text
- https://cdn.sqhk.co/rurufimibiwe/w3vjcie/v_live_bts_concert.pdfIn PDF document text
- https://cdn.sqhk.co/laxefotogulo/9heiihf/99138629138.pdfIn PDF document text
- https://cdn.sqhk.co/durotula/gdNjgjf/33978259720.pdfIn PDF document text
- https://cdn.sqhk.co/betewulo/QQ6gion/crossing_over_occurs_between_tetrads.pdfIn PDF document text
- https://cdn.sqhk.co/datisafapuv/gghZhhn/koveb.pdfIn PDF document text
- http://raruranakadup.iblogger.org/apixaban_fda_med_guide.pdfIn PDF document text
- http://tezuveripoxub.mypressonline.com/why_19_in_covid.pdfIn PDF document text
- https://cdn.sqhk.co/zaviresodew/fbTibhb/beach_buggy_racing_2_hack_apk_download.pdfIn PDF document text
- http://zaxevef.getenjoyment.net/what_is_chemiosmosis_responsible_for.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://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_2ddc8e1b156a483db373dddf43c68463.pdf?index=trueIn PDF document text
- https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_9073308df98744079b2bb3ab6c39a88f.pdf?index=trueIn PDF document text
- http://dojirezanis.epizy.com/34287603289.pdfIn PDF document text
- https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_e00e8a7992b74d3aac2503f5a8430539.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/tapexiw/graphing_quadratic_functions_factored_form_worksheet_2.pdfIn PDF document text
- http://reditab.epizy.com/the_butterfly_effect_3_480p.pdfIn PDF document text
- https://s3.amazonaws.com/mizeteb/afk_arena_contorted_realm_guide.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_off0000e888.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE888	4664 bytes
SHA-256: `ec592992e686452e798ab0982b9df65401f19160e314e825d278b0f0c99bc536`
`font_01_sfnt_off0000f85b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF85B	10232 bytes
SHA-256: `68b91e49ebfbd43fd7ec763321f06fc54bed809cd0c979960f9105edd125d119`
`font_02_sfnt_off00011b6b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B6B	4324 bytes
SHA-256: `7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71`

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