Malicious PDF — malware analysis report

Static analysis result for SHA-256 129a0cbab4350cc5…

MALICIOUS

PDF

84.7 KB Created: 2021-05-26 14:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee4b24d5b324f607cf0150c220c83334 SHA-1: faef30340e4a7495c6b933718466b3b6696b65e0 SHA-256: 129a0cbab4350cc5bfeb31fcee8fc08c1caa831b5c28da61e17310478e99b67d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on platforms like Weebly. This suggests a link farm or a distribution mechanism for potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://misekijenag.weebly.com/uploads/1/3/1/3/131380320/9721768.pdf
    • https://cdn-cms.f-static.net/uploads/4413231/normal_6048c6263d0e9.pdf
    • https://static.s123-cdn-static.com/uploads/4448740/normal_60078b53958b3.pdf
    • https://silixumofabu.weebly.com/uploads/1/3/2/7/132712413/feriraturuwomutapi.pdf
    • https://wakavofidokevi.weebly.com/uploads/1/3/2/6/132681750/e3be576c.pdf
    • https://gumulopeviw.weebly.com/uploads/1/3/5/3/135348062/5813eecaa7cbc.pdf
    • https://cdn-cms.f-static.net/uploads/4443598/normal_60301c1c8177f.pdf
    • https://lipijubirenazob.weebly.com/uploads/1/3/4/7/134722159/fda7a75921e8e9.pdf
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/4dc6ce36.pdf
    • https://cdn-cms.f-static.net/uploads/4452852/normal_6046417e3153e.pdf
    • https://pebuwopaduve.weebly.com/uploads/1/3/4/8/134853156/mabez.pdf
    • https://nadarikiwuxat.weebly.com/uploads/1/3/2/7/132712530/a3131ad0.pdf
    • https://cdn-cms.f-static.net/uploads/4373999/normal_6045649d455c9.pdf
    • https://tovamegudisolos.weebly.com/uploads/1/3/1/4/131411857/dba6ecd09380.pdf
    • https://josudirojupa.weebly.com/uploads/1/3/4/7/134729494/806d155ebc.pdf
    • https://tunibedexorole.weebly.com/uploads/1/3/5/3/135350281/fuveri-xawuzubed-dasifefelufulel.pdf
    • https://static.s123-cdn-static.com/uploads/4452173/normal_5ff6a9efbecb6.pdf
    • https://cdn-cms.f-static.net/uploads/4457311/normal_5fe84eceaa992.pdf
    • https://cdn-cms.f-static.net/uploads/4408587/normal_600acf2352f67.pdf
    • https://wopopodixela.weebly.com/uploads/1/3/0/9/130969383/refolamadagibabem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://feedproxy.google.com/~r/wb/ENAH/~3/vAIYpVcV8Aw/wb?keyword=phanteks%20enthoo%20luxe%20tempered%20glass%20full%20tower%20case
    • https://uploads.strikinglycdn.com/files/0eea791b-1ae4-43cb-ac74-08a13edbb9f3/nullclines_differential_equations.pdf
    • https://uploads.strikinglycdn.com/files/963339ea-9fa7-42ea-8385-6ac09cd556eb/i_am_a_man_chords.pdf
    • https://uploads.strikinglycdn.com/files/0aa9c570-048f-4b1c-bf36-3bc9909d2ba3/how_to_sterilize_dr_browns_bottles.pdf
    • https://uploads.strikinglycdn.com/files/877f1f0a-9f75-4e67-95d5-a872bb7d4db0/peavey_vypyr_30w_modeling_amp.pdf
    • https://uploads.strikinglycdn.com/files/1cfffc46-8865-403b-abe5-20d73f9b6a7e/35897952310.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc41.bin
137f20adfdc7fdaa944c59a9559b440f8092522b671e0a38824f2990f348ee68
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 5628 bytes
font_01_sfnt_off00010f4e.bin
f0adc3ce6b40c5175234fc8de07f7a1fad964e6def04d00398b6bfb040837ab6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4E 11808 bytes
font_02_sfnt_off00013685.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x13685 4324 bytes