Malicious PDF — malware analysis report

Static analysis result for SHA-256 976c683211cc88bc…

MALICIOUS

PDF

75.8 KB Created: 2021-04-03 21:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6a20bc0fffbcedfb74bcbe9ec96812df SHA-1: 2d374881d94c5e7f4d5e99dd7ae09a64513e224d SHA-256: 976c683211cc88bc3e0f55313a33b271ec9f0c0bedce5929699f00f5657cfda1
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/wix?keyword=langrisser+banner+schedule+2020+august PDF link annotation
    • https://belogukuke.weebly.com/uploads/1/3/1/6/131637095/b2f8fb8a04e3.pdfIn PDF document text
    • https://kafigibedup.weebly.com/uploads/1/3/4/4/134479504/1268574.pdfIn PDF document text
    • https://tawuvumiru.weebly.com/uploads/1/3/5/3/135326103/b9885c6a724a295.pdfIn PDF document text
    • https://sinosawalebito.weebly.com/uploads/1/3/4/6/134663044/losetukukigunip.pdfIn PDF document text
    • https://fobinoxibenor.weebly.com/uploads/1/3/1/4/131437242/majuwiwowuniputu.pdfIn PDF document text
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/soxagami.pdfIn PDF document text
    • https://kenoduzuran.weebly.com/uploads/1/3/5/3/135350653/d5f26c893.pdfIn PDF document text
    • https://gapeduruje.weebly.com/uploads/1/3/2/6/132681343/f9cd4c.pdfIn PDF document text
    • https://retevewaluwur.weebly.com/uploads/1/3/4/6/134600892/wibogu_vuwotususizini.pdfIn PDF document text
    • https://lolutisoxat.weebly.com/uploads/1/3/4/3/134315909/puwojoga_nonuburexik.pdfIn PDF document text
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/potafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tesepesizaz.rf.gd/canoscan_9000f_mark_ii_scan_to.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c88843d6-87fd-4e44-b05f-5a6a618808c4/powermate_3500_watt_portable_generator_carb.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/55974392926.pdfIn PDF document text
    • http://gasolawatovi.rf.gd/nabewukawujizima.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/wefajunixesufibosuwuxebip.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/13800619644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b84db1-e919-4426-8fe7-ea047dc71a49/hampton_bay_ceiling_fan_red_wire.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/how_to_take_evening_primrose_oil_ttc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74f362c0-8b30-4002-a6af-bb80e97957c3/dulikatimumotowebelawavo.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/3d_map_generator_terrain_photoshop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 5328 bytes
SHA-256: 57b9c69b4b4ec9b440ba5a556a7d56df2eb425689c4c38131b2b2bdb84aeb9fd
font_01_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 10296 bytes
SHA-256: b8576ab5b8dc3b457a9ea26e80fadaaa346dc39468b311811f670cdfa2b1de84
font_02_sfnt_off00011345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176