Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfe38b500d408e0…

MALICIOUS

PDF

74.4 KB Created: 2021-04-11 04:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 86959b55c8e45c4fffacd5680e6fe14d SHA-1: 608f5f064bd57c42dc2ff8c3266ccb0a7cf83b87 SHA-256: adfe38b500d408e0a3286ded2f0d2a9e49c4f9074b7f107a1365bbeca014aac1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent external URI, 'https://soxebez.ru/strik?utm_term=insinkerator+hot+water+dispenser+parts+diagram', is likely malicious, serving as a lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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://soxebez.ru/strik?utm_term=insinkerator+hot+water+dispenser+parts+diagram PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451556/normal_5fe4d8ecadb4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490269/normal_5ff0efd80c4dd.pdfIn PDF document text
    • http://tigibisolefora.mygamesonline.org/69375771820.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474750/normal_60200a516041b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417537/normal_5fe1f39590ea8.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/ceh_v10_certified_ethical_hacker_study_guide_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465387/normal_5fd94697cd296.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/vutame/96398809445.pdfIn PDF document text
    • https://722d0b64-886f-48d6-ad1d-3f240095bb95.filesusr.com/ugd/07f6b3_75cebb5e33da4363988df761ef802a43.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/biblia_holman_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/aws_s3_sdk_file.pdfIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_daa19da3d80b4b7099299016b092c70c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/mivefivirixuxozemovipax.pdfIn PDF document text
    • https://38c64f87-0506-4925-a3a1-425743e24937.filesusr.com/ugd/386d45_a1ef5c21282b423daf4a0d3aa9307914.pdf?index=trueIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_14cc403d34594fcbb78566b44a02bf32.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_08ecf6b9ebbf456fa171b018eb4092a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lerezazo/98349896056.pdfIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_39d0cdc00b7c497a849d255582f93ece.pdf?index=trueIn 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_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 5436 bytes
SHA-256: baee5bcb5e429a224b9dd3f20493dfb2b2c2026e248d593a281c9498fbfd63b8
font_01_sfnt_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 11488 bytes
SHA-256: e311ac158cea72bda658a044a66b79ec53e1b866855e82fa4e94d17ab27d4eb3

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