Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62e4e00863409bf…

MALICIOUS

PDF

82.8 KB Created: 2021-05-24 02:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b23a8474e0b453fd1d681f13d165aae0 SHA-1: 11cb55e4663a29e102b0666c12dc91c108264a92 SHA-256: b62e4e00863409bf0ccd3905c48aa539e0bb346c3c5d6148213ff3eaca318b21
196 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, indicating a phishing or malware distribution attempt. It contains a large number of external links, many pointing to SEO-optimized PDF files, suggesting a link farm or redirector strategy. The primary redirector URL is https://golowaki.ru/strik?utm_term=lowercase+cursive+writing+worksheets+pdf+free+download, which is used to lure users with the promise of free downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=lowercase+cursive+writing+worksheets+pdf+free+download PDF link annotation
    • https://wipedevibenisi.weebly.com/uploads/1/3/5/3/135315865/6831959.pdfIn PDF document text
    • https://bojebunu.weebly.com/uploads/1/3/0/7/130775379/koteri_xefafumefonagis_gekavur_rokubozojosum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465935/normal_5fcf0c1a9197f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5fdfd0e9541a1.pdfIn PDF document text
    • https://vibitidit.weebly.com/uploads/1/3/4/7/134712982/1252987.pdfIn PDF document text
    • https://rasofenetiko.weebly.com/uploads/1/3/4/8/134862321/2609877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_6020feaddd177.pdfIn PDF document text
    • https://kesizizuju.weebly.com/uploads/1/3/4/3/134384541/jifazowi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383579/normal_5ff19a1bd3764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385030/normal_6068d490ba8e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377410/normal_604c9f665a54a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472198/normal_5fecd491b58c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/yamaha_moto_4_350_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/587c757d-5e77-486b-a990-c33ffaf54844/how_to_light_the_pilot_on_a_wall_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/99531593945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa8aa801-6ff3-4b2d-85a3-3c8ee3a08ed2/17442423875.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/jovarebavekadimomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1332d377-58e6-4b73-b428-d86f4f6b7ac6/75677070336.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/40195745101.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/89040722224.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/79907385047.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/plateforme_bla_bla_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0a53c9-baf2-48df-bad1-a930ae06bfa3/sony_rx100_iii_price_australia.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 5456 bytes
SHA-256: 64cffc185e981f6f63e4b8f85d85e8cc2d220ec8be87fc99b7eaab5f7f3e2c2a
font_01_sfnt_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 7972 bytes
SHA-256: c5f1d16a4d3962e12dd53f1e0d64d2b17667b672b0e02730f4face849f39e6e9
font_02_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 10232 bytes
SHA-256: 4953c2497afa3775de9ca6f200067f185878e3e6bdf5d0390a2c20520964fddb
font_03_sfnt_off00012ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3