Malicious PDF — malware analysis report

Static analysis result for SHA-256 151b362fb7c5b311…

MALICIOUS

PDF

84.5 KB Created: 2021-03-20 19:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d52aa191ee6bb77840104dd1a8861f9b SHA-1: ea2f7dd57cc771d5d2c7d9c3868fc0f90a3597e4 SHA-256: 151b362fb7c5b311cdae2899e7cf38cac93e81186a90ed48bed4e9fddbb838ed
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicative of a link farm or phishing attempt, with one URL specifically mentioning a 'marriage guide' keyword. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://leonvi.ru/wix?keyword=harvest+moon+sunshine+island+marriage+guide
    • https://jifilebipik.weebly.com/uploads/1/3/4/3/134375607/desasegoguji-denapak-kilimi-tegogup.pdf
    • http://rumepado.mypressonline.com/telanikipinavuxosotiwij.pdf
    • https://nuzewive.weebly.com/uploads/1/3/1/1/131164046/werixeledipikuxivuso.pdf
    • https://zogabugopevaluz.weebly.com/uploads/1/3/0/8/130814784/7076381.pdf
    • https://kibanelamuvudu.weebly.com/uploads/1/3/0/9/130969844/1296656.pdf
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5ff0200fed333.pdf
    • https://beripoxepi.weebly.com/uploads/1/3/5/3/135325525/5000125.pdf
    • https://kotuposa.weebly.com/uploads/1/3/1/4/131406283/9785170.pdf
    • http://ottics.ru/mastering_physics_1d_kinematics_answerssqq8z.pdf
    • http://tezuveripoxub.mypressonline.com/amiibo_link_ocarina_of_time_zelda_breath_of_the_wild.pdf
    • https://xojovirasada.weebly.com/uploads/1/3/1/6/131637125/1207182.pdf
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/2846025.pdf
    • https://demijogukif.weebly.com/uploads/1/3/1/3/131382539/gerewafarivige.pdf
    • https://rezezeveg.weebly.com/uploads/1/3/1/8/131871466/88d77.pdf
    • http://esportzmlevent.com/exercices_sur_les_fractions_dcimales_cm2vwm5t.pdf
    • https://cdn-cms.f-static.net/uploads/4372382/normal_604f013ed23e2.pdf
    • https://fanolukexepafo.weebly.com/uploads/1/3/0/9/130969893/labajirukirun-banek-kugibozutadoli-relovitekev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zogadawedalifap.onlinewebshop.net/84611634685.pdf
    • http://sufixis.myartsonline.com/laxaronoluponolisarix.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e93d.bin
fdbbbc256d9d230c9ed6ed72516af28d7de04acb00a1ce28dcc69d96a4ea662c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 6932 bytes
font_01_sfnt_off000100cc.bin
2473767be3cc34c7ebdc97bd7a978a1efb3965da3ed8b2c3e3e21fdae5b52afe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 5144 bytes
font_02_sfnt_off0001120f.bin
3de822ff567c95ae9d97a0bf8f62843c21fd2b8aa8499bcdb3f5489eed09f802		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1120F 10624 bytes
font_03_sfnt_off000135f7.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135F7 4324 bytes

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