Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d97ac7a788a460…

MALICIOUS

PDF

75.5 KB Created: 2021-06-07 22:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ac6c1eb868a36ce8fec0b109a736b79b SHA-1: 563156b63aba44550abfaa2f28ab7bfc6c8625ac SHA-256: 12d97ac7a788a46020706dfb1aa060969bba4c88b42db85d28c52b0a0e6f19d8
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crewmak.ru/pbw?utm_term=the+hidden+messages+in+water+science PDF link annotation
    • https://devoporerok.weebly.com/uploads/1/3/1/6/131607733/8f2a324783.pdfIn PDF document text
    • https://malagabolej.weebly.com/uploads/1/3/4/4/134494973/jidunitodogag.pdfIn PDF document text
    • https://mudatikijamowa.weebly.com/uploads/1/3/1/4/131408537/8981775.pdfIn PDF document text
    • https://woronawupewusor.weebly.com/uploads/1/3/4/6/134672267/nusasukifibe-rakalamave-dojetu-fofevivubijorar.pdfIn PDF document text
    • https://wuwivuwo.weebly.com/uploads/1/3/7/5/137504369/xufeg.pdfIn PDF document text
    • https://kuvixajixi.weebly.com/uploads/1/3/1/6/131637850/lixunixidamefugel.pdfIn PDF document text
    • https://bamigifumu.weebly.com/uploads/1/3/4/4/134443618/624993.pdfIn PDF document text
    • https://talogaxuzule.weebly.com/uploads/1/3/4/5/134596774/8888807.pdfIn PDF document text
    • https://tepimetasufiro.weebly.com/uploads/1/3/4/0/134012902/gijusewujofaxibubuvo.pdfIn PDF document text
    • https://tagopudul.weebly.com/uploads/1/3/5/3/135392217/dotolunani.pdfIn PDF document text
    • https://vufemare.weebly.com/uploads/1/3/4/8/134855896/batug-ruvudu-kojopujamu-xavaturijerinon.pdfIn PDF document text
    • https://ruxosegid.weebly.com/uploads/1/3/4/2/134265817/3741132.pdfIn PDF document text
    • https://mitogisavubok.weebly.com/uploads/1/3/4/0/134019676/2298083.pdfIn PDF document text
    • https://rukepeninosiwul.weebly.com/uploads/1/3/1/4/131406291/pilatuwemapotuniforu.pdfIn PDF document text
    • https://sutisivanopazar.weebly.com/uploads/1/3/4/3/134310164/loxunidogaxiwap.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/deb16250-75ac-49ae-a8db-dc6517fb5d66/universal_gravitation_worksheet_answers_with_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37edf029-dcd2-4ab4-8f4d-532e2cef9fc2/52702315760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f8dc71-c607-4750-8596-aae56e104fbf/cengage_electricity_and_magnetism_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b840fad5-5a26-46f0-9a88-24e5dd867f98/36272603031.pdfIn PDF document text
    • http://ravowibosu.pbworks.com/w/file/fetch/144477258/20262629461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b6f5e5-259e-4c77-8fe6-1fee116d6d51/19855363870.pdfIn PDF document text
    • http://kikipudojuzo.pbworks.com/f/gukelizanoronorasamatawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eb64384-f651-4d43-aae1-05a6cbe88fc2/89428742666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/560cdc88-ec5d-488d-9154-ac6b09f1df5d/41213336200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/032b88b3-c13d-49ab-b91d-f4dcac440ef4/how_to_raise_native_chicken.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_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 5360 bytes
SHA-256: dfb0b9f0b0b6fa16a0ce19015574b86e89555ed7cd141b91bb2a492bceed8a8c
font_01_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 11284 bytes
SHA-256: a8feea3e0f8fbe21f2311254d69eac98bc504a67e9f5294c00b1197e91f6f56f