Malicious PDF — malware analysis report

Static analysis result for SHA-256 0491162b8f7e97ee…

MALICIOUS

PDF

77.6 KB Created: 2021-03-26 00:18:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 306531e419790adc393384c23e127daf SHA-1: b0ebe18643fafc840a18b29cd21c5e1dc8935053 SHA-256: 0491162b8f7e97ee105ed9d8571fa3bed57884dc6fdf98bc9eff24b340c06631
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/123?utm_term=cse+prelims+2016+answer+key PDF link annotation
    • https://wuluruvujomokax.weebly.com/uploads/1/3/5/3/135349857/cbe5140737a70.pdfIn PDF document text
    • https://kukitame.weebly.com/uploads/1/3/1/3/131379641/2931678.pdfIn PDF document text
    • https://gefogujuper.weebly.com/uploads/1/3/4/0/134012332/fegavutasexofal.pdfIn PDF document text
    • https://nokajavu.weebly.com/uploads/1/3/0/9/130969653/3343042.pdfIn PDF document text
    • https://lurufakezudaka.weebly.com/uploads/1/3/4/8/134884294/bf9d9b12.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/fireterexudo.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/kobivimelelo/59546713521.pdfIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_6fb7b4d883cb4b2b878b471845adf5e2.pdf?index=trueIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_e234295eec9d4e5baec58ae43c725f3c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bajuse/3328294954.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/block_number_on_whatsapp_android.pdfIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_0d22dc06de054553b8b6434ac0d9e472.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fodose/biology_spring_final_exam_review_answers_2018.pdfIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_98f26a582344425083c75578fbd9ebfa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/cuantos_centimetros_hay_en_un_centimetro_cuadrado.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/lazozi.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/40110407015.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/celtic_woman_danny_boy_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/12215423302.pdfIn PDF document text
    • http://fuxalobel.rf.gd/67739081373.pdfIn PDF document text
    • http://donofetesexok.rf.gd/kabbalah_the_tree_of_life.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 5608 bytes
SHA-256: 5b271d90acc01d24c421537e7388a3380ef8169a56deabaaf00e0c6eee6d7c70
font_01_sfnt_off00010545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10545 10648 bytes
SHA-256: 6534f7a3aae5d864c97e986f581db876dc5b935ab7cfd169a1e407d99d840678

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