Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54d62efe363fc77…

MALICIOUS

PDF

81.5 KB Created: 2021-02-27 20:18:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 2f9baf34862d43ad314e68dfd548b256 SHA-1: 94250effa968705a990902bcbde7ec3695891376 SHA-256: a54d62efe363fc778a4a5c850029d30a97a6dde5cc44fea978f76a3e53dd6fdd
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical PDF_SEO_LINK_FARM rule indicating a large number of external links. The ML classifier also returned a high confidence score for maliciousness. The embedded content, though heavily obfuscated, suggests a lure related to "Gold's gym trainer 420" and the presence of numerous external URLs points towards a phishing or SEO-based distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://resalured.ru/award?keyword=gold%2527s+gym+trainer+420 PDF link annotation
    • https://kisimerib.weebly.com/uploads/1/3/4/6/134697331/nowiz_jetivixoju_zosigi.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/komokadoga_vekefiraroze_nosero_xadife.pdfIn PDF document text
    • https://wovugozota.weebly.com/uploads/1/3/2/6/132695813/rejuk-nenowede-felodujigiburit.pdfIn PDF document text
    • https://vororesefuvemux.weebly.com/uploads/1/3/0/8/130813496/3c557.pdfIn PDF document text
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/4157939.pdfIn PDF document text
    • http://guwaxata.iblogger.org/nekajoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jagazuzigi.epizy.com/free_interior_design_flyer_templates.pdfIn PDF document text
    • http://palipesokugukux.epizy.com/gararupixozagafujaxe.pdfIn PDF document text
    • http://zamoguwudegovo.rf.gd/8814191970.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/33212338100.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/51474822088.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/kejufosoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/19824412521.pdfIn PDF document text
    • http://sewekovekejir.epizy.com/what_is_the_main_purpose_for_writing_a_business_plan.pdfIn PDF document text
    • http://livofos.epizy.com/divawewim.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/sajijawozalused.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 5464 bytes
SHA-256: b313359d9a03b8a426764920899c2f7587bed9db3f8da940ee4528ca6f7f020b
font_01_sfnt_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 10896 bytes
SHA-256: e9009ab294548f0c552598523f647425e3e847d2e61bde820b71b443714fa459
font_02_sfnt_off00012a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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