PDF malware analysis — malicious · 537f4cd86fb7c3c5

MALICIOUS

PDF

87.2 KB Created: 2021-06-08 23:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: de7355f3b6452cd2529628a7adfe2153 SHA-1: 1060a4c48356598a6d68f3f72de45d24bbb091ec SHA-256: 537f4cd86fb7c3c58203afb0913e9dd301fedd41b52f63f76ef124f6f9a1e958

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains text related to 'Bigg boss 3 day 1 full episode ', likely a lure to direct users to the primary malicious URL. The presence of external URIs and link farm heuristics suggests a phishing or redirection attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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://philabc.ru/pbw?utm_term=bigg+boss+3+day+1+full+episode PDF link annotation
- https://cdn-cms.f-static.net/uploads/4403262/normal_602efcef54178.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4383915/normal_60bbf0e0e90c3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4501385/normal_5fd7f631c25d9.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4481064/normal_5fd7987f731ca.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4470679/normal_6008e09e7a2df.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4370542/normal_600d2986c2a6e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4476758/normal_6021f6573c6e3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4445531/normal_60512fe3f361c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379486/normal_5fdc2606e01c3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4417221/normal_605bdc1c999d5.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://fedorahosted.org/lohitIn PDF document text
- http://pebokuvog.pbworks.com/w/file/fetch/144682377/xiwidijerigewabajadov.pdfIn PDF document text
- http://genarozep.pbworks.com/w/file/fetch/144496182/31921943312.pdfIn PDF document text
- http://jesababa.pbworks.com/w/file/fetch/144413874/tidun.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/72860bd7-8fee-4e42-b1cd-b0463087de92/the_motorcycle_diaries_full_movie_online_download.pdfIn PDF document text
- http://munonoraze.pbworks.com/f/makif.pdfIn PDF document text
- http://refarumiba.pbworks.com/w/file/fetch/144677445/kixiw.pdfIn PDF document text
- http://tusawijer.pbworks.com/w/file/fetch/144444393/42726486924.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/95ca947d-35d2-4f09-a265-247e9fc3d39e/siemens_tia_portal_-_plc_programming_basics.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/5b6e0932-2b1c-497f-99c7-550c2df183eb/4_types_of_operating_system_structure.pdfIn PDF document text
- http://bezawagiga.pbworks.com/w/file/fetch/144543813/how_to_drain_softub.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f1c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1C3	4560 bytes
SHA-256: `26df6f897087b0a02337156f776e20cfd90c41c9651c82bfa3b839875007e13e`
`font_01_sfnt_off0000ff5a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF5A	5620 bytes
SHA-256: `c3f7de3bd2d9ad8906b99fba4b286204343cb1017f629b17f0d2ec731a65e541`
`font_02_sfnt_off000112a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112A0	7464 bytes
SHA-256: `06356b8a42064052142925d700eb7310feed364083ec41f8473b5c52f48e9cdf`
`font_03_sfnt_off00012935.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12935	11100 bytes
SHA-256: `0fa461be734ed22116a024c99c4a1738e65b4d057724afb1bad26fdc70a2a6d0`

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