PDF malware analysis — malicious · 0bf295665f54e5f2

MALICIOUS

PDF

82.2 KB Created: 2021-03-19 23:26:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07

MD5: 28e9a0ed4357bbea3ecdb9c4fcddf4c4 SHA-1: 858857b73788d2895c32db14af29a9476de80501 SHA-256: 0bf295665f54e5f288a07c4a94200617d0b971c3f72d9d9f7e923188835f895e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm or SEO poisoning tactic. The primary malicious URL observed is https://xezojetit.ru/award?keyword=constitui%25C3%25A7%25C3%25A3o+do+estado+de+alagoas+pdf, which is likely used to redirect users to malicious content. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/award?keyword=constitui%25C3%25A7%25C3%25A3o+do+estado+de+alagoas+pdf PDF link annotation
- https://werakemil.weebly.com/uploads/1/3/5/9/135973214/pimawitenilufuk.pdfIn PDF document text
- https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/pamut_mugulopo_bizutodesube_nuzukakoraj.pdfIn PDF document text
- https://gozikiri.weebly.com/uploads/1/3/4/4/134493270/6ae0d78c8.pdfIn PDF document text
- https://zedetebi.weebly.com/uploads/1/3/1/0/131070456/1048696.pdfIn PDF document text
- https://xasigebopij.weebly.com/uploads/1/3/0/7/130775268/2222137.pdfIn PDF document text
- https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/sazizofobu_getobof_tidabofesitarew_napisori.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/jebokizez/49635074497.pdfIn PDF document text
- https://s3.amazonaws.com/baxunaf/keremigab.pdfIn PDF document text
- https://s3.amazonaws.com/vexosafugunu/69283812022.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/99a56d5c-3385-4662-8e75-14ecbaecf105/how_do_you_reheat_leftover_alfredo_pasta.pdfIn PDF document text
- https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_352677a01247433a96f6a784d8760d55.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/2e71e36d-7524-4edd-aed9-ae9c6ef7dec6/jack_reacher_2_netflix.pdfIn PDF document text
- https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_68b0e3fc29e74c16a7f3ae789ea572da.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/potamotaz/acrux_limited_annual_report.pdfIn PDF document text
- https://s3.amazonaws.com/sajatofubote/how_to_access_my_icloud_account_online.pdfIn PDF document text
- https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_3e1724fcdb774c95a9358d7fe2de5600.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/03d036d0-43e2-4f8d-b1cc-888255f4817a/terry_pratchett_quotes_witches_abroad.pdfIn PDF document text
- https://s3.amazonaws.com/zafijukopa/98042988702.pdfIn PDF document text
- https://s3.amazonaws.com/wotodedaruzuk/clifton_park_library_consumer_reports.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/3210ab1a-ce11-4f7b-918d-a6bc443d04f3/in_microsoft_word_table_of_contents.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/859236f2-341f-4b04-a10e-9cc6956b23e9/ice_breakers_mints_price_in_pakistan.pdfIn PDF document text
- https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_cdaf1c83d9d8424ba15f7fa1ea6d1b5c.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_off0000ee35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE35	5520 bytes
SHA-256: `646c341feefce0665f173f2b317883079ee97ef016cdfd36161b35331dd04b80`
`font_01_sfnt_off0001007c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1007C	13968 bytes
SHA-256: `421c98dfb13dfdb6aba4a80dd6ece7c8c0feb59c407e2afac0afcfc1c9e1d7f6`
`font_02_sfnt_off00012a8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A8B	4324 bytes
SHA-256: `05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176`

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