Malicious PDF — malware analysis report

Static analysis result for SHA-256 d622a22c223b2e7c…

MALICIOUS

PDF

78.5 KB Created: 2021-01-13 09:29:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d9b9e369e90258403d80bf9005aaeb88 SHA-1: d201f4f6d7aa43aabcefd521fd9e65a827709560 SHA-256: d622a22c223b2e7c9ef37fb4648a30770c83a70f445435918f5be2d5f66e835b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafficel.ru/aws?utm_term=angular+material+drag+and+drop+form+builder PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367941/normal_5fe41449d287d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417049/normal_5fbbb8982b870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_5fbb30a3f2db2.pdfIn PDF document text
    • https://site-1180537.mozfiles.com/files/1180537/48704030049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5f87ba4e04f02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5f9c6fdc33dec.pdfIn PDF document text
    • https://site-1168003.mozfiles.com/files/1168003/fiji_airways_flight_status_811.pdfIn PDF document text
    • https://site-1180277.mozfiles.com/files/1180277/wolfquest_3_pups.pdfIn PDF document text
    • https://cdn.sqhk.co/golomamone/hitgjgj/football_referee_shirts.pdfIn PDF document text
    • https://site-1173692.mozfiles.com/files/1173692/provincial_2018_equalized_assessment_report.pdfIn PDF document text
    • https://site-1177706.mozfiles.com/files/1177706/polidab.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/navoburarovada/define_contemplated_as_a_verb.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/circle_magic_plus_quilt_template.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_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 5312 bytes
SHA-256: afee296c3910751d1edb80766aa4ffff75930b4e876d0e2b0b3cf182761fe014
font_01_sfnt_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 11716 bytes
SHA-256: 43cfe86a799bd4f7498d4c8bfefea6d70d8f0e6b1c851e6fe3b51d1946d12963
font_02_sfnt_off000117ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AE 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf

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