PDF malware analysis — malicious · bbfded960c15a2ae

MALICIOUS

PDF

79.0 KB Created: 2021-03-22 10:11:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21

MD5: 1909db627d1d7fd2ffbd0210b1312c1c SHA-1: 2744c4fbf37a9fed50f6dec8257e7b5b0d0b8251 SHA-256: bbfded960c15a2aeb9440e344db747d899066a09543863e3608904f3df208a69

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The PDF contains a significant number of external links, with one heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL observed is 'https://kuzutuzo.ru/award?keyword=gazetted+holidays+2020+in+himachal+pradesh+pdf', suggesting a phishing or SEO-based malicious content delivery attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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=gazetted+holidays+2020+in+himachal+pradesh+pdf PDF link annotation
- https://cdn-cms.f-static.net/uploads/4529780/normal_6056e7a1cb941.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4413705/normal_60418ceb56a20.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://s3.amazonaws.com/dalava/square_one_art_signature_template.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/01b3dc65-275a-490c-a505-f3a6490f8b73/56846053017.pdfIn PDF document text
- https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_220d6718349543fa934644bb8dbc30a1.pdf?index=trueIn PDF document text
- https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_7ae825ad979747e7aa91af93676a6799.pdf?index=trueIn PDF document text
- https://bed2d873-735b-46bb-a8a3-264d0455df4e.filesusr.com/ugd/03ede2_187d9dad80994452888b1a0e6f33c661.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/daniwodug/tudonurugupalo.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0152317b-b2e2-45ce-b512-af525cb15728/ac_joint_dislocation_physiotherapy_exercises.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e4c394ae-7b63-4881-8107-e88b92ac8c65/4182705945.pdfIn PDF document text
- https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_e088bec86b98409a933c3706af13e1ad.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/bofake/moffat_weather_report.pdfIn PDF document text
- https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_da6702e6c865419d9fdb2d380f5bf3d6.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/dumupa/20982977834.pdfIn PDF document text
- https://s3.amazonaws.com/luxelula/slow_violence_and_the_environmentalism_of_the_poor_by_rob_nixon.pdfIn PDF document text
- https://fb1cd387-549b-40f1-a5a4-67fd65d29bb3.filesusr.com/ugd/4200b4_e20f91621bee4a9bad3dd62d6bd8e411.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/6f044118-8523-4610-852c-e0e3aa7258eb/29220899196.pdfIn PDF document text
- https://s3.amazonaws.com/goneduzum/mudured.pdfIn PDF document text
- https://s3.amazonaws.com/geradi/champak_marathi_comics_free.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/abe93a7f-ba17-456e-ad13-703039211125/brainpop_matter_changing_states_worksheet_answer_key.pdfIn PDF document text
- https://s3.amazonaws.com/tozaduliwubega/99927648104.pdfIn PDF document text
- https://s3.amazonaws.com/pevuwarobuvowa/49468551269.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_off0000e846.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE846	5640 bytes
SHA-256: `5024343bd4fbe7790abd3d19e5948b74a60ba707f177fde202702e465d6890e8`
`font_01_sfnt_off0000fb50.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB50	10772 bytes
SHA-256: `dfd4f428fd7f4a95ad1e935321d53c6f5ec320603724b13c69bf7b856cf4613d`
`font_02_sfnt_off00012055.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12055	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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