Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a03eab3b943b28c…

MALICIOUS

PDF

90.4 KB Created: 2021-02-19 10:51:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8ff056ecd9947d0f83719d818fbce2ab SHA-1: 2fbf930c7028c5994a0f05558809aa6823f01712 SHA-256: 4a03eab3b943b28cec1a4eb1f5a0078831412f04e90088d4d4d9fe39d1d97d4d
274 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are part of a link farm designed to host phishing content. One critical heuristic identified a brand-impersonation credential phishing lure targeting Instagram, directing users to a malicious redirector. The presence of multiple PDF links and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/8976984.pdf.
  • 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://crophysi.ru/strik?utm_term=thesaurus+activities+for+4th+grade In PDF document text
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/8976984.pdfIn PDF document text
    • http://milanomoda-italy.website/water_engineering_textbookf7fhd.pdfIn PDF document text
    • https://lekaretuzej.weebly.com/uploads/1/3/0/7/130738752/gunubodosolelag-zorusukabapa.pdfIn PDF document text
    • http://copyrightsupport-ig.com/roman_catholic_bible_in_urdu_free_downloadu0fz2.pdfIn PDF document text
    • http://yeswins.space/arihant_differential_calculus_download7wlqi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485698/normal_601d25eb675ed.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/470dce977fd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384164/normal_60037cc13fe5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473616/normal_600bf05ab0eec.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/napejaxosinages/86211728458.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/sinifudetu.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/judunijujolexerut.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/android_phone_file_transfer_windows_10.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off00010e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0A 5348 bytes
SHA-256: 2d1e3e62b99330b85e0fa07d3bf2380de0079bd6f72d98cbc2d00f40ed121941
font_02_sfnt_off00012041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12041 12152 bytes
SHA-256: 2051b6d06e44ca59d6d26f57e6433e95f1f7a715a9b3b59339f2947c43a54787
font_03_sfnt_off00014799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14799 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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