Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a254b7cbba97c9…

MALICIOUS

PDF

84.9 KB Created: 2021-04-11 18:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 50b3e2c4a7c98a4651a7eb1e932e6496 SHA-1: d14896ec009579f9cf874168254dd06b89457335 SHA-256: 48a254b7cbba97c9ed140535b7ec036b0a3cc9dc4c8f66bf4a05a72f2bfb86f6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable domains or user-generated content platforms, indicative of a link farm used for phishing or scams. The ClamAV detection and ML classifier further support its malicious nature, flagging it as a phishing trojan. The embedded URLs and the heuristic firings strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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
  • 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://xezojetit.ru/strik?utm_term=what%2527s+a+mean+word+that+starts+with+o PDF link annotation
    • https://guwokizesagemi.weebly.com/uploads/1/3/4/8/134855090/7679889.pdfIn PDF document text
    • https://tojumofudino.weebly.com/uploads/1/3/2/6/132681199/7449145.pdfIn PDF document text
    • http://perfectiona.online/36557202416q5wfz.pdfIn PDF document text
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/7095237.pdfIn PDF document text
    • http://helpverifedbadges.com/41922623371lhsn9.pdfIn PDF document text
    • https://lubigovoxudi.weebly.com/uploads/1/3/4/1/134109264/21932860dcf.pdfIn PDF document text
    • https://lepovomika.weebly.com/uploads/1/3/4/7/134701686/bewezidamoz.pdfIn PDF document text
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/lidebab.pdfIn PDF document text
    • http://carinsusa.info/first_alert_model_sc9120b_change_batteryz59c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c27b039-eae4-4e49-a01f-0edb198ace46/51001628266.pdfIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_0b223b7877304bc8bb1313a47cdf5cf1.pdf?index=trueIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_13f195a3a26b4b09bb0828f3acbc0c24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xesigeze/brochure_cover_page_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/53488089400.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/how_to_wire_a_harbor_breeze_ceiling_fan_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df225421-a140-4f40-9926-bbc075c4bf6a/witujomewar.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/grade_2_phonics_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff33b51c-a666-423b-b112-4476dd656e0c/fapofeb.pdfIn PDF document text
    • https://926fca10-1439-4adc-b819-38dad5327275.filesusr.com/ugd/26d6d3_353da18efa0143f7b58b8f69aa7aa933.pdf?index=trueIn PDF document text
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_9c1132c04a66489a8a6b8c35cc6e4dee.pdf?index=trueIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_41f4778f024e49b1996496ee657da380.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/zufivevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf0f0d4-8b88-427a-8dd8-f1835ba473a3/rixisarulokubobigufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ffd541-a6ca-492e-bf4f-667326426ead/mazabedeta.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_off0001108c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108C 5172 bytes
SHA-256: 65b5cfe23d38da4a91fee49a8f14e5d0552d33da510f77a4d485c005cac6cad6
font_01_sfnt_off00012210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12210 10372 bytes
SHA-256: d6ea97475ea931fbc8bee3904aa4c442b10017288656c7deaff2b534160ae3ff