Malicious PDF — malware analysis report

Static analysis result for SHA-256 e69f502ace8b785f…

MALICIOUS

PDF

80.5 KB Created: 2021-04-01 18:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d722403faff036b4bd4ae9f3eb1b9b56 SHA-1: c3fc8f1ac33f1dea4633a1a5cf1b4fdb95b5fca5 SHA-256: e69f502ace8b785fbfa55bd300fb0486a28ddb40445ab884f47b2556dc11cd52
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://nipisod.ru/aws?utm_term=ejercicios+de+estadistica+resueltos+paso+a+paso+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379973/normal_6059e2238e09b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416654/normal_60119b274a87d.pdfIn PDF document text
    • https://cdn.sqhk.co/pixefavenar/hdNS2ie/lobasurapavazego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_6037e5c443087.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/rbse_11th_maths_book_downloadjel1b.pdfIn PDF document text
    • https://dirotigakavomak.weebly.com/uploads/1/3/4/2/134235834/wolufuvi-takojafuxu-sakaxe-xoxizexo.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/86643251250.pdfIn PDF document text
    • https://latimemoniborij.weebly.com/uploads/1/3/1/4/131437487/rogevekez-nogibexevugug-sirid-nisekiwox.pdfIn PDF document text
    • http://idealica-italiaofficial.site/american_college_of_chest_physicians_guidelines_pneumothorax9sdi3.pdfIn PDF document text
    • https://zagiwesojuju.weebly.com/uploads/1/3/2/7/132712322/nexofos.pdfIn PDF document text
    • https://vobikonim.weebly.com/uploads/1/3/5/3/135390296/xijimopewejoje_katefisulagup.pdfIn PDF document text
    • http://linunewilut.mywebcommunity.org/bpsc_syllabus_2020_download_in_english.pdfIn PDF document text
    • http://zebiripu.mygamesonline.org/42998758957.pdfIn PDF document text
    • http://sesalon.xyz/5251278848442bd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_600e9cc0e6ddb.pdfIn PDF document text
    • https://cdn.sqhk.co/leburogutu/esMieW1/83397925276.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/ozicYig/babuxesejasivopatupuroj.pdfIn PDF document text
    • http://xazupadapafow.mypressonline.com/74725149506.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/7hjjgjS/amazon_prime_music_app_iphone.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/55143108091mdiik.pdfIn PDF document text
    • http://vsspb.ru/fovelogitesavivuo4kiu.pdfIn PDF document text
    • https://cdn.sqhk.co/nixenexax/MhajfP5/99437583215.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vasofirida/best_platform_games_ios_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/affliction_warlock_7._3_pvp_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/gills_camouflage_platform_sneakers_steve_madden.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_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 1872 bytes
SHA-256: 82f30745d1fb873379318f2d42ec1cec373ed0047a72e384f79ae3fc36ffe934
font_01_sfnt_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 5180 bytes
SHA-256: 95a6c64e20b429c31b167b0e26b225d8c36864899fc07624fe08a9c22eb9a1a4
font_02_sfnt_off00010af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF7 11788 bytes
SHA-256: 7f7ddc0b8592f56a982b699f445128edd29b282fa0b64559d9fb5addc3500fb0