Malicious PDF — malware analysis report

Static analysis result for SHA-256 157a68b3a53c422b…

MALICIOUS

PDF

61.9 KB Created: 2020-11-13 18:06:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 43179d2e5d3b88ed0f2f2218bc637f80 SHA-1: be2b17148d0b33e3d8d4c7af882db687ac55a5f4 SHA-256: 157a68b3a53c422b856fe2c321260d9a66714b2db514f8da516b5e1b9f22a35c
274 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 redirector infrastructure and are associated with brand impersonation for credential phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are used to direct the user to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://senevabitup.weebly.com/uploads/1/3/4/2/134234896/nutizifako.pdf.
  • 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://traffmen.ru/strik?utm_term=a+10cm%25C3%259710cm%25C3%259710cm+wood+block+with+a+density+of+680+kg%252Fm3+floats+in+water In PDF document text
    • https://senevabitup.weebly.com/uploads/1/3/4/2/134234896/nutizifako.pdfIn PDF document text
    • https://bugukafu.weebly.com/uploads/1/3/4/4/134490359/losufabafegajipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426416/normal_5fa55a330d2e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389616/normal_5f95cc5f5bf52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f883b644cfd7.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/voxiwaximimifugusadi.pdfIn PDF document text
    • https://gukijofajileraw.weebly.com/uploads/1/3/4/3/134392650/salalevevewab-penukoni-jovomozuvizox.pdfIn PDF document text
    • https://finelesazik.weebly.com/uploads/1/3/4/7/134715738/fc15b9d48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_5faa2223dc1ed.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/xiniguvukivixa-zotupaz-jawavu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gomakobez/usos_del_aceite_de_ricino.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/panduan_belajar_bahasa_thailand.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/40587482445.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/93250459101.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/english_cartoon_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/rangers_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/45132264320.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF10 6672 bytes
SHA-256: 445720ddff4fb6f42a8ef3c3e90c2cf5928cc953eb86d277ed0828630285239d
font_01_sfnt_off0000c5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B6 9712 bytes
SHA-256: 838ef4456a6b8605a6e700db2453d729448d499be21877239a0f1fb659665d8d

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