Malicious PDF — malware analysis report

Static analysis result for SHA-256 137872c5f7181773…

MALICIOUS

PDF

82.3 KB Created: 2021-01-28 15:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d9e7a96d8c8ef341cef1ba883aaf3c88 SHA-1: 989aefa986c9268cd5e1229f574bf62370336fd2 SHA-256: 137872c5f718177334d55ad0bd7d771c5ed66d39a073570fdeca17347917ae40
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a likely attempt to distribute malware or conduct phishing. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to redirect the user to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://leonvi.ru/wb?keyword=kannada%20devotional%20songs%20ringtones%20free%20download PDF link annotation
    • http://lifeeuro.info/rumabwa2zf.pdfIn PDF document text
    • https://tilolujow.weebly.com/uploads/1/3/1/1/131164317/kadaz.pdfIn PDF document text
    • http://save50.pro/shoot_em_up_lyrics_cypress_hillqtdii.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482629/normal_600fa5305a86b.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/dubonawafosunv5fwv.pdfIn PDF document text
    • http://ita-talia.fun/kapazoun2sm.pdfIn PDF document text
    • http://groby-ritual.online/fazonirurolo3of8o.pdfIn PDF document text
    • https://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/afeb2cb4.pdfIn PDF document text
    • http://best-store.club/68702436077bo29d.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://kudogato.rf.gd/90575259421.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/33187071925.pdfIn PDF document text
    • http://melumudinev.epizy.com/19976281781.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/op_amp_circuits.pdfIn PDF document text
    • http://puzexexaniledow.epizy.com/ergomed_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/bake_sale_flyer_template_free.pdfIn PDF document text
    • http://javasuk.epizy.com/aceable_level_10_assessment_answers.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_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 4984 bytes
SHA-256: 34d36f3b048eff71d4d4f60c583281c7f87f1bdba3835b3976a0c216c8b6ac4a
font_01_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 10592 bytes
SHA-256: 09c1916dd6e3ceab0a14584de6e54038f41628728db717407982dda8dd658b78
font_02_sfnt_off00012d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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