Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5acbff0f07818aa…

MALICIOUS

PDF

78.0 KB Created: 2021-04-27 07:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3c86fb7db2a5830f2e0b976ea53a6347 SHA-1: c3842823e718d6dc661f5d2dcac085ce218f6511 SHA-256: f5acbff0f07818aa1603fce06d4e550f37f6d570244d9871d59c13728cc251e9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was identified as malicious by multiple heuristics and a machine learning classifier, including a critical finding for a PDF link farm. It contains numerous external URIs, with one prominent example being https://seumenha.ru/strik?utm_term=weber+grill+light+not+turning+off. The presence of a large number of links, some on disposable hosting, suggests an attempt to manipulate search engine results or redirect users to potentially malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=weber+grill+light+not+turning+off PDF link annotation
    • https://vepufekuso.weebly.com/uploads/1/3/0/7/130775624/butekira-mofit-bulagelijumabe-mowaledapiju.pdfIn PDF document text
    • http://lightsex.ru/rizilitelo0i9we.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/de_que_trata_la_novela_la_ciudad_y_los_perros1wpcu.pdfIn PDF document text
    • https://lesesagipamagaz.weebly.com/uploads/1/3/0/7/130739561/8459118.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/8d58fe32-4592-4a3e-ab4e-b7647bdfa245/23607698166.pdfIn PDF document text
    • http://jojugabijogi.rf.gd/audio_converter_portable_free.pdfIn PDF document text
    • https://a9d1d3ec-13fa-4b7e-abe1-abe2c2ba1301.filesusr.com/ugd/f83029_3d92fa641c0b4ec1a4b7492bf3bd3242.pdf?index=trueIn PDF document text
    • http://tuzererelutido.epizy.com/bubeluxonilimawotov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6bb218d-85b4-422a-b68c-866d17b75898/reading_pop_culture_a_portable_anthology_2nd_edition.pdfIn PDF document text
    • http://nisebot.epizy.com/hp_officejet_pro_8600_premium_user_manual.pdfIn PDF document text
    • http://debukigezi.epizy.com/difference_between_lincoln_and_johnson_reconstruction_plans.pdfIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_01e53bdd9914458685c7a31be2e754c5.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_3b6a5a1fdb6446158a98b92051a4d38e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a021193-fb5c-4a68-be35-207263358caf/how_long_does_it_take_to_refresh_apps_on_sky.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_5d6abad8e2b44c3eb287651333b718f1.pdf?index=trueIn PDF document text
    • http://nixefumov.epizy.com/tijofelejetewexulavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8b33359-6d5f-4fd8-943d-a4f781df14ef/what_ink_does_hp_photosmart_6510_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b769711-b3e1-4feb-ae0a-7ce1d6f2aae8/hitachi_reviews_tv.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.

FilenameKindSourceSize
font_00_sfnt_off0000e619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 4676 bytes
SHA-256: 4d45f35e974b912297c3ae9ffdcb21fc6ef707d017195f2b93ada750101e26ea
font_01_sfnt_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 10848 bytes
SHA-256: f2a4417b140501747216e7f7abb4ec4f14bd865564e7bffaee0ff9e5e67d3c0f
font_02_sfnt_off00011af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF3 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71