Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d73df80026953b…

MALICIOUS

PDF

82.9 KB Created: 2021-03-10 00:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ceea2cba5d47561b1d3d4acd870e2357 SHA-1: 9b5404904a97f79d4ab3bbbfb1395b76ec59406a SHA-256: b7d73df80026953b050456d21683d8ba92796aaa7cd4c04394493a1872169b2c
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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/aws?utm_term=2013+toyota+camry+maintenance+required+light+flashes+8+times PDF link annotation
    • http://nupewijanetari.medianewsonline.com/how_to_write_numbers_in_ap_style.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/walmart_prescription_safety_glasses_prices.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/is_wendys_spicy_chicken_salad_healthy.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/learn_english_speaking_for_beginners_youtube.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/28cd5fa1-a477-48b3-bfc9-aef86b78bf5e/how_to_rob_a_coin_operated_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fedba98-2c4b-477f-9d58-d7653579c4af/91872998831.pdfIn PDF document text
    • https://c9ecad83-e70d-4e71-84d8-0086c45344aa.filesusr.com/ugd/01a317_a4a2e087dcc94b24b408c7f6b9529ae3.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_935ffd1cc0504cccb1ee7292c93e3ab9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd2b395-fab5-42dd-81fb-b9c0425c516b/integrated_chinese_workbook_level_1_part_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6c55bd9-0df2-48cf-ac4e-e771e59769d5/bamovadedoku.pdfIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_c96f0c036c8246058627d6f972b7e957.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc4f612-0f77-4798-8904-ca850fa08a42/1429996920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43d06d3c-2b27-4b03-bd37-e289bd1f0d31/lugubilekumamik.pdfIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_7c5584c3587044b0aa6c2fc170683705.pdf?index=trueIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_9efbfe16bd9f45ab815de43403a20caf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/546c6e76-f832-4d43-9b64-c75626eb87a9/48620708986.pdfIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_bcefb78fbec24338ade4e280263b5423.pdf?index=trueIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_ad4798392cf44a9a9d6d3eed9ec2da41.pdf?index=trueIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_dddfa6ce194f4cbd985e0a6e3f2cb371.pdf?index=trueIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_9e1f1c09967b4d22ba2b33d9dbcf2e1a.pdf?index=trueIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_a1caada8b00445e4b49507345c139f73.pdf?index=trueIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_64d8fd3485054e25908885237185da22.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac0eb88b-e9b9-4c9d-a8eb-62bccb9aa4a6/kutifilure.pdfIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_bd3b8278b3f74535b3e2bfc2f96df34d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a4d9b1-8571-4b00-a06e-e1a65f742cd3/83815487755.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_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 6252 bytes
SHA-256: a618da57148b1a65474408d8cfadc1e559ca50bdf0dcdc02ba4282e546898e78
font_01_sfnt_off00011996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11996 10556 bytes
SHA-256: 12b1afe834c0c97bb0d6357908cfb0fb8303e59a45b3c4d71ced48f50be56c88