Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3122dbf92802547…

MALICIOUS

PDF

103.1 KB Created: 2021-03-24 18:22:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: acd9c60ac1b7376e5f5203ed4162670e SHA-1: 148f5204f323d77df5cc1fccd2beb0fc871c2cf9 SHA-256: a3122dbf9280254794f335be51dd36e8efb9e1552c346223d805d59dc34e3df2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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://golowaki.ru/wix?keyword=citizen+u600+manual PDF link annotation
    • http://morasuxod.getenjoyment.net/how_many_covid_cases_in_texas_right_now.pdfIn PDF document text
    • http://gmetry.online/kipipezurudasesajevobuwed27b0w.pdfIn PDF document text
    • http://fudilumow.22web.org/public_speaking_topics_for_ca_students.pdfIn PDF document text
    • http://wamabivunufoteg.medianewsonline.com/bumirulabixot.pdfIn PDF document text
    • http://felesatediz.medianewsonline.com/arthrographie_du_genou.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/how_to_pair_skullcandy_crusher_headphones.pdfIn PDF document text
    • http://1xbet-registr.site/skeletal_system_webquest_answers0961z.pdfIn PDF document text
    • http://yachts-4-sale.com/weber_grill_home_depot_couponsttswy.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/jixemijigujotetip.pdfIn PDF document text
    • http://tademiz.iblogger.org/fanasinagigefonuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wurunuj.epizy.com/kufujowuxobovagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9815fbd-9e4f-48c8-8ac7-be195c6b428a/35236951961.pdfIn PDF document text
    • http://tisajepi.epizy.com/pengertian_abnormalitas.pdfIn PDF document text
    • http://topufopotu.epizy.com/48135205231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fdcb1fc-81a8-47c8-9c92-4c082f408892/9810550702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d554f1-ab00-4bc5-9c52-c650cd0c760f/simple_zone_plays_for_youth_basketball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0055623-251b-4a2a-a6be-1bbab589d266/95761250552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6feb457c-5239-4fc5-9487-740c0a29a443/go_math_grade_4_textbook_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6904dadb-2fc0-4629-a4d3-9be5b8350b2d/nowutowufewiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01dad610-a8bf-4caa-85f2-54a88afc5d72/carry_on_wayward_son_neoni_karaoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fd850a3-a626-47b6-a0f2-832db6442a33/does_red_cross_test_blood_donations_for_covid_19.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf8aee8c-4c8f-458b-846d-38b3735e4754/nofx_the_hepatitis_bathtub_and_other_stories.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_off00015589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15589 4808 bytes
SHA-256: 34b5d6209ceff3a510dcce0b63e7397a68436d2139ed01f7f846de05531de057
font_01_sfnt_off000165d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165D2 12224 bytes
SHA-256: 3637fa10abe1cf9e1901d54a79bb25b5e0dd10640561e36c26dbd10ee1ea2c2b