Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e48da5b067f9aa…

MALICIOUS

PDF

65.5 KB Created: 2021-02-21 18:06:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6aef01507ea645b3f1474820bd1ec7f SHA-1: 9c3cf034b43d40f56dc5246c171208a6062a09a3 SHA-256: a1e48da5b067f9aac09bc857e649116178e10a84f281167735b23a9dc5f022ae
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files hosted on various domains, indicating a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' and the presence of many unknown reputation URLs strongly suggest a malicious intent to distribute further malicious content or phish users. The 'SE_CALLBACK_LURE' heuristic also points towards a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crophysi.ru/123?utm_term=reloading+shop+tulsa+ok
    • https://vokevifiv.weebly.com/uploads/1/3/4/6/134657891/sadugemajaga.pdf
    • https://cdn.sqhk.co/vefutifeves/fhd5ifh/munipowaja.pdf
    • https://cdn.sqhk.co/zuronenom/DijaheM/riotzone_ru_kody.pdf
    • https://cdn.sqhk.co/fuluzezufe/foAgdhe/pozirumidonasemof.pdf
    • https://cdn.sqhk.co/jogepirar/5jh79gf/40064232229.pdf
    • https://cdn.sqhk.co/difakezil/u2gzZgd/kuwaxetujonarazakuno.pdf
    • https://cdn.sqhk.co/guwewaxa/jbibtgi/92133049978.pdf
    • https://kegozogoro.weebly.com/uploads/1/3/4/5/134525602/zawonovibesi_nigutopuzeke.pdf
    • https://cdn.sqhk.co/vadezewe/phwifji/lanuzekobafogalusopad.pdf
    • http://goldstein.capital/fowokisedilovugizejez0eo1.pdf
    • https://cdn.sqhk.co/nutewakizi/2d4hd3S/92668980609.pdf
    • https://cdn.sqhk.co/vefapatape/aa8fiiS/vuloviraxurobutegagu.pdf
    • https://nisofopirumo.weebly.com/uploads/1/3/4/4/134478351/luxiwexopudiga.pdf
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/6805376.pdf
    • https://gitazedekof.weebly.com/uploads/1/3/1/3/131398323/1636934.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zalupadinukoz.rf.gd/cara_buat_akun_fb_baru_lewat_android.pdf
    • 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_off0000c41e.bin
59b7c82ca28f80dba04e1a2da3636c27af5f7f74fdfb72762c99ee44ae4e4dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC41E 5196 bytes
font_01_sfnt_off0000d5d4.bin
66d972528473654d2da1d412f131be2d9fa04565101ff8f4ffbbe07130ef0c30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 10332 bytes

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