Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63f7984eef55ddd…

MALICIOUS

PDF

73.6 KB Created: 2021-06-12 16:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 66b791a51ab48c63f2570c87110a17d7 SHA-1: 3c189ac45e1b7e824bd76b66ae30cb6ec7a97994 SHA-256: f63f7984eef55dddf2e9099341c7ff4f0e1ff1ab3cfbe3a85a1097cbff63df08
244 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=yosemite+climbing+guides In PDF document text
    • https://kipokemob.weebly.com/uploads/1/3/0/7/130738996/ruxewefubujodi_luxijisevepog_dutekanod_vanozolokosiv.pdfIn PDF document text
    • https://dixatobuvug.weebly.com/uploads/1/3/5/3/135321084/moxetanovakobepipaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501212/normal_605d82047964c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471945/normal_5ff891413f00d.pdfIn PDF document text
    • https://vigujixuvavotuv.weebly.com/uploads/1/3/5/3/135391978/fixokimuvolap.pdfIn PDF document text
    • https://foxevavudutis.weebly.com/uploads/1/3/4/3/134380199/zuzimunenoto.pdfIn PDF document text
    • https://dowoxadi.weebly.com/uploads/1/3/1/3/131380004/fivekuwo.pdfIn PDF document text
    • https://xizunobalik.weebly.com/uploads/1/3/0/7/130739811/96396.pdfIn PDF document text
    • https://nopeludaseji.weebly.com/uploads/1/3/3/9/133986928/eafe6b3ee49.pdfIn PDF document text
    • https://rugakimi.weebly.com/uploads/1/3/5/3/135323030/859b128a03.pdfIn PDF document text
    • https://purolitawi.weebly.com/uploads/1/3/4/8/134894903/ruxaxoponejipojod.pdfIn PDF document text
    • https://vozupixog.weebly.com/uploads/1/3/4/3/134312338/547709.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392237/normal_60022538deac6.pdfIn PDF document text
    • https://kozipizifepawu.weebly.com/uploads/1/3/4/6/134631686/wanaresad-litinotujaz-fiborat.pdfIn PDF document text
    • https://bagugesi.weebly.com/uploads/1/3/0/7/130775983/2585420.pdfIn PDF document text
    • https://kuvakikarubefi.weebly.com/uploads/1/3/1/3/131383404/7217634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454419/normal_601690e29935c.pdfIn PDF document text
    • https://dexugagemer.weebly.com/uploads/1/3/4/7/134715037/nawumokek_gugalozefado_jemurijanek_tuzoruwos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417305/normal_600bc9fac9e32.pdfIn PDF document text
    • https://boxagotogod.weebly.com/uploads/1/3/4/4/134491964/jesito.pdfIn PDF document text
    • https://lorujuxivole.weebly.com/uploads/1/3/4/5/134595667/2262034.pdfIn PDF document text
    • https://nowusunomotir.weebly.com/uploads/1/3/4/3/134314498/5542361.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/31845a1f-47fa-4cac-998a-b5787305b7a4/energizer_battery_charger_flashing_red_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21ab2b0d-acfe-4f99-bfb6-607b36d65228/baixar_livro_casamento_blindado_2.0_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2ba512a-0982-40e4-935d-2700e0bec7a3/dracula_bram_stoker_short_story.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_off0000d387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD387 4936 bytes
SHA-256: f4421b6264c62ac3420a818cad40b5bb0d3b6c11721e38f11cbd839b5e65f4bc
font_01_sfnt_off0000e439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE439 11320 bytes
SHA-256: bc85dad7582b8a94f768209b433c532bd266dda7763bc79ee9459df84dc8e9fa
font_02_sfnt_off00010af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3