Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cd7a238a4e4a5f…

MALICIOUS

PDF

78.5 KB Created: 2021-03-16 06:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fd1e995ec04b591d335f54fda48945aa SHA-1: 5d10fe46205fbb0dbf2ea0eaeb2deca551460a41 SHA-256: b8cd7a238a4e4a5fb215528fea7c75ba517e7a5237637abf25165d96311b9385
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution scheme. The primary purpose appears to be directing users to external resources, likely to compromise them further.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=palutena+guidance+ultimate PDF link annotation
    • http://agentsoft.space/zanedavubant5jtd.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/chpXnqM/pac-_man_world_2_ps2_iso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405639/normal_60307811175e5.pdfIn PDF document text
    • http://about-igsupport.com/environmental_science_14.1_earth_the_water_planetvvo4g.pdfIn PDF document text
    • https://bisudika.weebly.com/uploads/1/3/4/3/134366448/nevabebez-modatabomof-dufikuweves-sibewujez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374373/normal_5fc692f032d7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481161/normal_602d037dbff52.pdfIn PDF document text
    • http://itrom.fun/fono_ingilizce_gramer_kitabmueua.pdfIn PDF document text
    • https://gakosokilexavum.weebly.com/uploads/1/3/2/6/132695298/zazegizaru-lidixume-dexokomul.pdfIn PDF document text
    • https://sijapuxojowul.weebly.com/uploads/1/3/4/6/134616399/xazebukusazubosenufi.pdfIn PDF document text
    • http://reduslim-europa.site/21897028024vwloe.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/aribEia/xaxena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_6029973653946.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/hbieJge/33290745169.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403946/normal_5fcfa7b090867.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/QhbFjfO/kefupareradibatug.pdfIn PDF document text
    • http://trylait.club/is_eso_pvp_good_2020u0usq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459796/normal_5fc88f13b5790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464302/normal_600df9b5842d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 5156 bytes
SHA-256: 0645eb745d8ed6a3889362d0c2134680be632f12833ac0d8c454ca7e817fd1fd
font_01_sfnt_off0000f60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 4988 bytes
SHA-256: 9369e0dce5d832c738971f57f056df2e8b46bec5c6ef14234c4ec944ebb151b1
font_02_sfnt_off000106f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F8 10668 bytes
SHA-256: 6259cb2fd200d8e9fac857e459d37f45702a98ef8099620610a9714dea48469e

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