Malicious PDF — malware analysis report

Static analysis result for SHA-256 591b429abd8f99bb…

MALICIOUS

PDF

67.6 KB Created: 2021-03-26 04:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b893f16b353c9271e8585c291cf0e48a SHA-1: 2368f6147e5924746fb7d0541da81c9fd69323c8 SHA-256: 591b429abd8f99bb2a5e004968542a3d0ea4c0ebc84a54b7cacb06b9aee4194b
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting or redirectors, indicating a link farm designed to distribute malware or phish for credentials. The embedded content suggests a lure related to a Kindle charging issue. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8544

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://baarspo.ru/aws?utm_term=kindle+model+d00901+will+not+charge
    • https://wonakusoxenim.weebly.com/uploads/1/3/5/3/135340368/2467043.pdf
    • https://lazezareb.weebly.com/uploads/1/3/4/3/134311903/2801341.pdf
    • http://suwivewewidi.22web.org/wevikiwijegeriku.pdf
    • https://zonidazoledod.weebly.com/uploads/1/3/1/0/131070441/2866101.pdf
    • https://dawudetunik.weebly.com/uploads/1/3/5/9/135972975/d643bdf.pdf
    • http://tobufasir.iblogger.org/muhs_bams_degree_certificate_form.pdf
    • https://jikuvubavul.weebly.com/uploads/1/3/5/9/135964228/gasesaxazaxe_setevuwik.pdf
    • https://nawowelefet.weebly.com/uploads/1/3/4/4/134498780/vogagok.pdf
    • https://dulipitigisol.weebly.com/uploads/1/3/4/7/134717891/7530279.pdf
    • https://xobagesimijuvu.weebly.com/uploads/1/3/0/7/130776740/wirujo_poluwoxavotiwad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_4bc5de78e33d412ead61ad60032cd1be.pdf?index=true
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_70b571c8db5f43e78a256907decf5272.pdf?index=true
    • https://s3.amazonaws.com/besafefaf/25211539282.pdf
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_6720b87c87b04918a6535a22002f4c71.pdf?index=true
    • http://masuroti.rf.gd/fiperef.pdf
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_373eaf4058d94d1eae2b1b708d09eaa2.pdf?index=true
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_603bb7e2b776429daa6506cc722507df.pdf?index=true
    • https://ec75ba9f-29a7-4b73-bb51-4c951d20089f.filesusr.com/ugd/17cde0_3649480fcb2a4bb2b8e9a108b4e9efbb.pdf?index=true
    • https://s3.amazonaws.com/vefagotoje/sabokowojebuvasufolag.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7eb.bin
7417e0f4b2c96616be3ee0c9e9110832f9813a5feb89d7a9106173ee3011c2ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 5588 bytes

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