Malicious PDF — malware analysis report

Static analysis result for SHA-256 997a4106cb87e235…

MALICIOUS

PDF

35.6 KB Created: 2020-11-06 13:12:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f33bec86e495b7763c11dbd059d9f5d0 SHA-1: 98acdb5bfcc9f864defc9d917ce2a07a3719a51d SHA-256: 997a4106cb87e2357f039a53452251bda6345d3d9725e308b3fd8ae960c4f69b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'April 2019 psat answers' and includes numerous URLs, suggesting a phishing or SEO spam campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://traffine.ru/aws?keyword=april+2019+psat+answers In PDF document text
    • https://zeginuvo.weebly.com/uploads/1/3/0/7/130775519/886233.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/kezedivalo-bolumukejufufik.pdfIn PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/kafazosigemibisa.pdfIn PDF document text
    • https://fimupekegu.weebly.com/uploads/1/3/4/5/134502303/1496661.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/fefurorobumi/15755138884.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/kevamup.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/dnd_5e_curse_of_strahd_full_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/folivisegofikeje.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/bionaire_heater_bh3950_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/44886999509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/723c2dae-7880-400a-bda4-97c9058467d4/compendium_of_materia_medica.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/92174995715.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A88 5376 bytes
SHA-256: 8b72a1f060de97f302f996202d4f9ddb2c32c3ba9d67914715039ba9174aa274
font_01_sfnt_off00005ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CED 10948 bytes
SHA-256: 19780983f7df611b4965a4f834189960950c12c4c6fab343243d332d55a5a50b

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