Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8d107f14aa0df0…

MALICIOUS

PDF

76.6 KB Created: 2021-03-05 09:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b3964e7dfa0dd40126a4aa808accad52 SHA-1: 92c8ca4852d7505291c0c8ed6adb17ed059a0d95 SHA-256: 7c8d107f14aa0df03b2d469471c57be045a34a163e5fc3271a476e3fad927cc6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jottigo.ru/strik?utm_term=what+shows+are+on+us+netflix+not+in+australia PDF link annotation
    • http://fitnesspack.net/photo_frames_unlimitedarnic.pdfIn PDF document text
    • http://1offpark.xyz/935273070990g1dp.pdfIn PDF document text
    • http://nely.xyz/kerefawafky6rw.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/where_is_the_battery_located_in_a_2020_chevy_traverse_2011.pdfIn PDF document text
    • http://vnds-v.website/xulagekoramiluw1zolt.pdfIn PDF document text
    • http://hookup153.space/hospitality_industry_resume_templatejbdvs.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/8985970d-0831-453d-b135-bc19c9b41b5e/62163451744.pdfIn PDF document text
    • http://widepidaba.atwebpages.com/how_to_calculate_car_engine_efficiency.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef8c6b4-6bae-42d0-b670-27e48e284d4f/timet.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/fowulusapazopevu.pdfIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_2805b888dcfe4811a5245c5a48a60f3e.pdf?index=trueIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_3c8b31f5dcd34ca48022b739390e7205.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/119c378d-c50f-444d-8074-5ee0d36066fe/buy_all_american_pressure_canner_australia.pdfIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_9c87c944b58a494886a36d87a03f2c0c.pdf?index=trueIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_60056b2ad1bf423b833e9586cb2b4055.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/959a483c-5f16-446f-93c3-85c859cf1445/dragon_age_origins_best_dps_mage_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88798ca0-7af8-4c3f-b589-eb807f29b2cf/jakod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/326090af-1e93-4e84-8698-f7072485dd9a/43838936219.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_51c6429bf8de4d969972192a33ae7b53.pdf?index=trueIn PDF document text
    • http://gezixus.myartsonline.com/63992318320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b69c08b6-abaf-45fa-ab2d-6f9993866d5c/51500469469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82c3f592-f303-4330-8dcf-f770dd67f576/19813388919.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/lenovo_y510p_bios.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_off0000ecb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 5028 bytes
SHA-256: a650e065fefcf428d4bf2537dbc11f418f31f81c7fdb5574c46375d4dcd5fa38
font_01_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 12132 bytes
SHA-256: a8ced51f8dad064889adca878613ebf3c737faf0eea18b87ab3dafe026bfcdb5