Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5fc5dd90f5d3b2…

MALICIOUS

PDF

79.4 KB Created: 2021-05-13 13:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6341274550fae2827badcdd7cd4309e6 SHA-1: bd589524b06cf6e9bd042db55c426743e78421e2 SHA-256: 0b5fc5dd90f5d3b2a2c5e61b0d1392ab9719685db2f5428eb9e212d3932a517d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://xezojetit.ru/strik?utm_term=how+to+experience+the+manifest+presence+of+god
    • https://pemesekisubabas.weebly.com/uploads/1/3/4/6/134659876/f77377e8988104f.pdf
    • http://thesalle.xyz/54095224547halxe.pdf
    • https://vuvogotekepuma.weebly.com/uploads/1/3/0/7/130776629/fetezawigoku-sojufipev-jurazunomo-zijidox.pdf
    • http://kufigada.22web.org/aha_guidelines_for_diagnosis_of_heart_failure.pdf
    • http://kinoogf.space/sony_dsc_f828_video_qualityahxdr.pdf
    • https://cdn.sqhk.co/vaxikinanibu/jrhhiaU/bams_4th_year_syllabus_2019.pdf
    • http://regse.website/19545731592s7s0l.pdf
    • http://vorgazme.com/99614743632l8uy0.pdf
    • https://koxowugazetumul.weebly.com/uploads/1/3/6/0/136015765/c3c4d427.pdf
    • https://zadavutuni.weebly.com/uploads/1/3/4/3/134343582/xevoni.pdf
    • https://zawoxabupuw.weebly.com/uploads/1/3/5/9/135990747/1407061.pdf
    • http://sberpodarok2020.online/14107785597iible.pdf
    • https://cdn.sqhk.co/xowuzaseku/1jboXnK/doot_skeleton_png.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e1dd9d5d-2564-403b-b9eb-750b563e155e.filesusr.com/ugd/00b056_4d338b364f364b5f844510cd13bf8e1b.pdf?index=true
    • http://bejegexojadivaj.epizy.com/vatopojada.pdf
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_db06361d94124f088bd6a6caf9f29de1.pdf?index=true
    • https://s3.amazonaws.com/zonebon/74100024754.pdf
    • https://s3.amazonaws.com/towutoginadivu/subewopunuvu.pdf
    • http://zudibaj.epizy.com/jasademesetisa.pdf
    • https://s3.amazonaws.com/kaxukok/tuget.pdf
    • http://bibonajemag.epizy.com/jofujilogisijepatu.pdf
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_d78c397f96c345da94b62b23ff8ca7a3.pdf?index=true
    • http://robexede.rf.gd/classify_triangles_by_sides_and_angles_worksheet.pdf
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_b9f16a6ff8304733a0fd2d6c38e64a1a.pdf?index=true
    • https://s3.amazonaws.com/bejenosugede/26048597113.pdf
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_0583f33508014b9abc5ea91ecf48e313.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ab.bin
de70a0a34ff27f701d26f7f78d2a61d010c5ec6177768f042f8ef9333b160f10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 5660 bytes
font_01_sfnt_off000108d4.bin
e038ff1f2e25a9cdecef7b968aefc49aa00f007673fdaabdd9a12d2b4e70da39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 10788 bytes

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