Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f59ed30ba330fc…

MALICIOUS

PDF

64.9 KB Created: 2021-03-07 13:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 792f6fefc954c4476ae247d0f2b910ac SHA-1: d75fc7c535854b7eadc6a48b9f881eb66f777711 SHA-256: 75f59ed30ba330fc0a7792b20aea73ed50bcd88135b0e442d25c82f5cfb96299
156 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a phishing or malicious link distribution scheme, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and numerous embedded URLs. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external links like 'https://druttle.ru/wix?keyword=the+pirate+proxy+twitter' points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=the+pirate+proxy+twitter
    • http://vulefuxudonad.22web.org/75200222235.pdf
    • http://bikomowaxibujoj.medianewsonline.com/kuvimivotomuwosavajuj.pdf
    • http://milansit.space/alkalinitas_airzinh3.pdf
    • http://my-credit.info/couperin_les_barricades_mysterieuses_imslp0cme0.pdf
    • https://tatisosef.weebly.com/uploads/1/3/5/3/135333589/mefuvusejatevexe.pdf
    • https://buxapuwale.weebly.com/uploads/1/3/2/8/132815799/936b3b51.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vigevot/settlement_agreement_template_free.pdf
    • http://navepufukoxo.rf.gd/focusrite_scarlett_2i2_review_espaol.pdf
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_271fd9d080fa4b41a6ad5b7d8058b61a.pdf?index=true
    • http://miwewugewu.atwebpages.com/easy_chicken_breast_recipes_george_foreman_grill.pdf
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_613d7e588a8749f1a4102588008caedb.pdf?index=true
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_d1b7c0798c6b4c93b37f437a249b60c7.pdf?index=true
    • https://s3.amazonaws.com/lupebesu/genie_screw_drive_garage_door_opener_troubleshooting.pdf
    • http://ragidunu.rf.gd/segowedigej.pdf
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_297a23f9146d4236b3c12f244100ad70.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_off0000c666.bin
a2471d684b33d90f69efbba6c5f7ab2299e7618cb37c222159555b7743ce0f15
pdf-font-stream PDF embedded font (sfnt) at offset 0xC666 4908 bytes
font_01_sfnt_off0000d728.bin
faddb930bc19d8a31af961ca568550fd98fe29b3f5954bca364600af792bdb32
pdf-font-stream PDF embedded font (sfnt) at offset 0xD728 9516 bytes