PDF malware analysis — malicious · dca41ef51acbdf85

MALICIOUS

PDF

75.4 KB Created: 2021-03-10 10:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: c7ec1e10d856617422f58c33a0bbbbd3 SHA-1: 891063413f3c44f8dae78bb94f4c20d489eaff85 SHA-256: dca41ef51acbdf85b0f37307ef5aca83ae4caa1e091d6313676600efd1404cd3

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external URLs, many hosted on disposable domains, and is flagged by heuristics as a link farm and a phishing/malicious PDF. The embedded document body, though heavily obfuscated, contains text related to 'A5 browning serial numbers', suggesting a lure. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect the user to potentially harmful content.

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://gimoguvi.ru/strik?utm_term=a5+browning+serial+numbers PDF link annotation
- http://coolvdomaion.online/ropudisezameguwofuh4zo4.pdfIn PDF document text
- http://vorecan.space/75757642810dcvjm.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4484364/normal_603ba1c4c2a51.pdfIn PDF document text
- http://potenciy.xyz/8624070216y167q.pdfIn PDF document text
- http://workshop-fb.ru/33572706592o06be.pdfIn PDF document text
- http://blankid.ru/5875113644huzup.pdfIn PDF document text
- http://gratoramm.website/the_zookeepers_wife_full_movie_greek_subs6f2dd.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4409395/normal_60014f2282028.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4412158/normal_5ff081e66560b.pdfIn PDF document text
- http://tehnopolis.org/436563137875thwc.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4455381/normal_60196feacf36f.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4366321/normal_5ff283673afd7.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://uploads.strikinglycdn.com/files/ef2c8202-dcaa-4586-ba7b-4dce12f26960/japarevuj.pdfIn PDF document text
- https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_4eca52a9cc784625bd91fbe58fb2c20e.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/46acc90a-8fba-41b5-bafc-fe70f2e7f0f5/jupajifug.pdfIn PDF document text
- https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_2ef4311c80ce4be09598c0ee7a576e7b.pdf?index=trueIn PDF document text
- https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_dfea96084c6c45fbb3b940b339aee6df.pdf?index=trueIn PDF document text
- https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_1f9db6770b2644939c18b3a243b829e9.pdf?index=trueIn PDF document text
- https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_27b0313b874d4641b37efb56a6ce0f02.pdf?index=trueIn PDF document text
- https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_f9660af1ef6b491197d77e0e31a99471.pdf?index=trueIn PDF document text
- https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_d9159b1b405c4295a1305297bb26fcd1.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dd5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD5D	5152 bytes
SHA-256: `60fddced7c0c5d8d3d4aa2d9b6bfedc8ff2558aea0c38a234092f03018470537`
`font_01_sfnt_off0000eecf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEECF	10328 bytes
SHA-256: `5f05e8247770dfe9f9a0837e9642f35388f980e466ca4d7d50ef4f3d70f895df`
`font_02_sfnt_off00011248.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11248	4324 bytes
SHA-256: `0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333`

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