Malicious PDF — malware analysis report

Static analysis result for SHA-256 2168457539b6a6fd…

MALICIOUS

PDF

82.4 KB Created: 2021-03-13 12:49:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 13587471d8dc754637ae1a6f777e5145 SHA-1: de3772dfe4a7c301c813b3925b7aa3448a3e2801 SHA-256: 2168457539b6a6fd6d65d61e71d17b3d41ec90d3e1eec7078368a0c440467e95
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The embedded URLs point to various domains, likely serving as lures for users to download potentially harmful files or visit scam websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://nipisod.ru/wix?keyword=nova+launcher+prime+apk+2018 PDF link annotation
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/dukasoz-zedan-juzef.pdfIn PDF document text
    • http://cucoupon.info/34308928375156f5.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/tabutavamaja_javitu_bubozise_gagekogekupe.pdfIn PDF document text
    • https://mikugixu.weebly.com/uploads/1/3/1/4/131438693/2308055.pdfIn PDF document text
    • http://flylovel.com/mafefivuvenakalxrjyu.pdfIn PDF document text
    • http://xaninivinekeni.iblogger.org/rabarutokuzewinesav.pdfIn PDF document text
    • http://exampl1214.com/gufixigypq1.pdfIn PDF document text
    • http://tiktoktop.design/wordly_wise_3000_book_36mejf.pdfIn PDF document text
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/kigunokufo_kiretesodof.pdfIn PDF document text
    • https://xifemobagot.weebly.com/uploads/1/3/4/0/134000541/nasajola.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/7441474.pdfIn PDF document text
    • https://bevoparekev.weebly.com/uploads/1/3/4/0/134018333/7413829.pdfIn PDF document text
    • http://akfb.online/hot_dog_keep_away_gameoe8hi.pdfIn PDF document text
    • https://vizejuvevu.weebly.com/uploads/1/3/2/6/132681979/4382052.pdfIn PDF document text
    • https://xepozumer.weebly.com/uploads/1/3/1/3/131380160/2689018.pdfIn PDF document text
    • https://wuvobarapupi.weebly.com/uploads/1/3/0/8/130813490/nixurakovi-kolawajibumano-zosebugaxojo.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://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_095381a13f094e5ea89bcf74d816ef10.pdf?index=trueIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_3421b269d33f48cfa54b4892a3bfac53.pdf?index=trueIn PDF document text
    • http://sutepaxevak.epizy.com/us_post_office_mail_recovery_center_phone_number.pdfIn PDF document text
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_b54898a60ae9417d8652af20c4306f6b.pdf?index=trueIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_70167560b7e14dc79545997b7aa8abca.pdf?index=trueIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_2e209898d2a046de86218ec3d7f82510.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.

FilenameKindSourceSize
font_00_sfnt_off0000f539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 5408 bytes
SHA-256: 56add328e38507a811b0ebc37572040d12321b69a81cbd7106eada55eb16443b
font_01_sfnt_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 11248 bytes
SHA-256: c1c25c4cab98e715ff7d6c4e972e9f42e6adfbd30549f41042ca888c0fd2a391
font_02_sfnt_off00012df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e