PDF malware analysis — malicious · c1fceab53c049558

MALICIOUS

PDF

78.1 KB Created: 2021-04-05 09:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13

MD5: e4bbffd3fa7519b351a0011637f5c595 SHA-1: a9d6b4c36ba9d8a544bffe21d2eac10d1da68bd3 SHA-256: c1fceab53c0495588a9a1d2902cacd360ba35e6792dac48f57588028449fc7b1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of numerous external URLs and the phishing/trojan detection indicate a malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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 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.
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://kuzutuzo.ru/award?keyword=auto+dwg+to+pdf+converter+chomikuj PDF link annotation
- https://cdn-cms.f-static.net/uploads/4465403/normal_60512206c9a18.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4381738/normal_60053dc4ed285.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4369927/normal_600077c5e3b95.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4528876/normal_6031cc21b9890.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4473039/normal_600dd7f280f1b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426415/normal_604cd55cb5b1f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4385434/normal_6020a50956e91.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4370097/normal_5ff84e1e6b292.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379029/normal_60377d67d8f36.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4472216/normal_5ff40577c733c.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4476566/normal_5fd0645ab3063.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4374535/normal_60682641190ee.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4392667/normal_5ff8b8ef59dbd.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4476946/normal_5fd0557906800.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/bakoloj/49675010177.pdfIn PDF document text
- https://6dd05bf8-a32e-4ce7-8057-9a1894012cff.filesusr.com/ugd/4ce960_46326e3595cf4f77a55f9ce635bab539.pdf?index=trueIn PDF document text
- https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_ad75848503584833bef6e9c20c49448f.pdf?index=trueIn PDF document text
- https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_c8430b2f59054bb7a54e8cb11814b832.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/464df01f-fd6f-4d6e-9371-0dbeeda0c5fd/6028972395.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/dc134ddf-93df-4ef3-9a33-df54174695e2/how_to_find_your_spellcasting_modifier.pdfIn PDF document text
- https://s3.amazonaws.com/webipejonavuv/maytag_3000_dryer_f01.pdfIn PDF document text
- https://s3.amazonaws.com/lusegokaves/android_4._4_iso_for_pc.pdfIn PDF document text
- https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_f9cead250d8b419d8e24d96c155eec3b.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/1f78f26b-161b-4634-98cf-6630d1a45650/how_does_dehumidifier_work_on_portable_air_conditioner.pdfIn PDF document text
- https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_d953f0053052444791119e2a9f979491.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f5a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5A1	5432 bytes
SHA-256: `119abb21295f1b7ccc483c851459be43eabaf90d766ef82ffbbbb84622931955`
`font_01_sfnt_off00010818.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10818	10728 bytes
SHA-256: `4fb139d2ddf525fabe23deb21e83575f3e3e5dccfa825283c4ae321383952bc2`

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