Malicious PDF — malware analysis report

Static analysis result for SHA-256 e30a442728b2cf72…

MALICIOUS

PDF

73.9 KB Created: 2021-02-26 05:50:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5d9c80e3524583111c8e6e409e2b40fe SHA-1: 38d044b3a650dac27feb3664d8e4b6487aac3557 SHA-256: e30a442728b2cf72d9ab7649ae7f508b3044c8254df64f5cfaaeddf9f9c25d4b
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain keywords related to printer toner, suggesting a lure to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or malware delivery via the embedded links.

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
  • 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 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.
  • 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://yafferge.ru/123?utm_term=hp+laserjet+pro+400+m401dne+toner+cartridge+number In PDF document text
    • https://cdn.sqhk.co/mewedenemez/ut1ifgc/destiny_summoner_mod_apk_unlimited_money.pdfIn PDF document text
    • https://walagikolisof.weebly.com/uploads/1/3/4/4/134494282/jelatudakeranef.pdfIn PDF document text
    • http://ch-redirect.icu/meloxafibefeledj2.pdfIn PDF document text
    • https://pipabujul.weebly.com/uploads/1/3/2/6/132680817/roxufitibiguk-fadaginosivazi-dosani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_60348ba5e3349.pdfIn PDF document text
    • http://bluebadge-support.com/duet_definition_spanishjh7fn.pdfIn PDF document text
    • http://realwockyc.info/lipid_metabolism_mcqs_with_answers1e7rv.pdfIn PDF document text
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/tejogezopagoso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498994/normal_5ff1eeb61200e.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/jdZjiiX/cricket_score_counter_online.pdfIn PDF document text
    • http://siankaanmexico.com/jesolapozi1wyk9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_6035a915897a0.pdfIn PDF document text
    • http://antinomi.design/34900111309cinuq.pdfIn PDF document text
    • https://cdn.sqhk.co/samidabaxik/nRfsLhd/pixel_coloring_pages.pdfIn PDF document text
    • http://xavedevub.iblogger.org/33270894751.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404308/normal_6006731f357f2.pdfIn PDF document text
    • https://sakolepak.weebly.com/uploads/1/3/4/5/134588428/nipomoxuwexuwem-vomizod-lasotavi-tavanefunedevu.pdfIn PDF document text
    • https://cdn.sqhk.co/pajijolabalu/2djgIid/34041067139.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/OShd7Ek/cw_shows_on_netflix_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372100/normal_5ff58229d421f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 5852 bytes
SHA-256: b9039a93ff4ad93489d3e3d282e59e39b7b5755651be07fee82108a55de5dc5e
font_01_sfnt_off0000f3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FF 11296 bytes
SHA-256: 0be2eda8af799ed80f9ca74a41d5d9a7996d68e6049090399fcdea727016be09

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