PDF malware analysis — malicious · a2556bc4db4cd595

MALICIOUS

PDF

83.9 KB Created: 2021-03-25 16:13:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20

MD5: b0f9da93cc2f5b4de48539fe754b74e7 SHA-1: c09881cf5829b99f19f54193abfb7a61ae0b9ec8 SHA-256: a2556bc4db4cd5954594d9a8c3cd217843cebccf16dc8eefd718989b84fd9db3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with one prominent link pointing to 'https://xajibur.ru/strik?utm_term=2011+ford+mustang+gt500+0-60'. This suggests a malicious intent to redirect users to a potentially harmful site. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan distribution mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://xajibur.ru/strik?utm_term=2011+ford+mustang+gt500+0-60 PDF link annotation
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/pogolo/76381769217.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ad1978fe-2e0a-4d28-a1ac-b25f0ea91ab5/free_dressmaker_2402_sewing_machine_manual.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7e8d7268-d5f7-4224-a927-f6b44ccf19e0/65134220470.pdfIn PDF document text
- https://0f3c41ac-de96-4ba7-a517-026d7435d592.filesusr.com/ugd/8631de_7ec1a2fbf9054437b5f4c1941aa50fe9.pdf?index=trueIn PDF document text
- https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_4901cbacdeff417da49da67dd07169df.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/bulujono/76548902493.pdfIn PDF document text
- https://s3.amazonaws.com/faluzotixupi/how_to_setup_tp_link_powerline_wifi.pdfIn PDF document text
- https://s3.amazonaws.com/pisik/drawing_embroidery_software_free.pdfIn PDF document text
- https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_fdb06f6aaf454feb99347e4c3007aa9f.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/kubafezin/john_deere_x304_bagger_for_sale.pdfIn PDF document text
- https://d429d46a-6203-486b-8c9d-ede5597e1383.filesusr.com/ugd/419b00_bd6ff76ddfe24c7ebe3d3797e4e8df50.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/saxefi/choo_mantra_kali_song.pdfIn PDF document text
- https://s3.amazonaws.com/rexogeguxosix/certified_fraud_examiners_manual.pdfIn PDF document text
- https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_b265b98da47d4de58a81637daf6053f4.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/1af4b5ef-7f6f-44df-a16f-34ae3d846672/what_is_the_definition_of_psychological_effects.pdfIn PDF document text
- https://s3.amazonaws.com/kovilowab/baby_girl_names_with_ed_in_them.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/872164e6-c3ae-478b-8a20-09b29fa5bef7/how_to_sue_the_court_system.pdfIn PDF document text
- https://s3.amazonaws.com/gelawiweza/agreement_termination_letter_format.pdfIn PDF document text
- https://s3.amazonaws.com/xakapudakadu/photoshop_cc_2014_32_bit_free.pdfIn PDF document text
- https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_f66e60c5c27445518d2b1e98bbe43184.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/tiniruru/using_commas_worksheets_ks3.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f309.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF309	5736 bytes
SHA-256: `d49431b091d11198c7ca6cfdc396fd87108619003a31910bcb7f9ef0448c7a6d`
`font_01_sfnt_off0001068f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1068F	11336 bytes
SHA-256: `1f1d8dc52c6d7148561a985aa13edda245574a3a53d8e06a159bc1582007f3d5`
`font_02_sfnt_off00012d8f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D8F	16036 bytes
SHA-256: `9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940`

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