Malicious PDF — malware analysis report

Static analysis result for SHA-256 5427b0740185a8a7…

MALICIOUS

PDF

76.2 KB Created: 2021-03-22 13:33:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1a9ad85861ebf929457e858941b50e7a SHA-1: fb97ca92f964d638aa30fed0c495a20210576ca4 SHA-256: 5427b0740185a8a705ddf3cb9fac6d056b325bd7ce81e8b7fd88ccbeb8cbaaa0
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. One of the primary links, https://baarspo.ru/wix?keyword=midsegments+of+triangles+worksheet+lesson+8-4, appears to be a lure for educational content, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the extensive link farm and malicious verdict indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/wix?keyword=midsegments+of+triangles+worksheet+lesson+8-4 PDF link annotation
    • https://maxolesaso.weebly.com/uploads/1/3/0/7/130776327/kurabevazebizokuz.pdfIn PDF document text
    • https://funebaxap.weebly.com/uploads/1/3/4/3/134399245/wavalepida.pdfIn PDF document text
    • http://ogranicbio.space/gan_cfoprz5dx.pdfIn PDF document text
    • http://parkji5x.xyz/ocean_eyes_sheet_music_pianozio0t.pdfIn PDF document text
    • https://warajepij.weebly.com/uploads/1/3/4/6/134608856/a303eb.pdfIn PDF document text
    • https://wimazuwog.weebly.com/uploads/1/3/0/7/130740080/f584c590c.pdfIn PDF document text
    • https://gapuropiti.weebly.com/uploads/1/3/2/7/132740804/gaxakuvijikuzadujuji.pdfIn PDF document text
    • https://kaxutaxi.weebly.com/uploads/1/3/4/3/134387751/3176489.pdfIn PDF document text
    • https://ditakusoboke.weebly.com/uploads/1/3/1/4/131437623/mibinojuw_bipino.pdfIn PDF document text
    • https://tuwunujanopir.weebly.com/uploads/1/3/4/6/134617400/3066500.pdfIn PDF document text
    • https://jatekowi.weebly.com/uploads/1/3/0/7/130776123/javunevakig_pefowusapekiju_lifegino_tidilo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/xovod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea982275-df89-423b-8d30-051501b04a6d/vifirutoruwepulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/436c2961-b4e8-49da-8815-dc2775bf0fb8/sportster_1200_rebuild_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9fc70bb-bf7d-4f1c-9359-be8c76e78c30/fifty_shades_of_grey_theme_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4eb5fc1-c0d1-4895-b396-6448fb56f649/47176063597.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/jazz_piano_sheet_music_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/super_vpn_pro_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/17991720984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53bcf6ee-4f88-4051-938b-6e853b063150/ice_breakers_for_zoom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca6e9bbd-c79f-4b80-9376-3d0d6e0aceab/how_to_relieve_constipation_and_bloating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82f4dafd-d628-4a2e-b9f9-4b12cb7a7b16/37184686188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a499e84-a979-412a-bfc0-26b77eace501/4803559143.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD481 5796 bytes
SHA-256: 90c39cbbb2c62b49db3ccd1422d7871b9f5843644368d95ed0c55b057ca1198d
font_01_sfnt_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 10816 bytes
SHA-256: 48b80b447e42aeb138c442867ca0a808873a12589e2d5e40b6032cb6178e67a4
font_02_sfnt_off00010d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D59 16072 bytes
SHA-256: 24c5c481937acf4f4841e6563a6d7a18cfdb810806c94b09ac0ff4033348c1e6

Open this report in the interactive analyzer, or submit your own file for analysis.