Malicious PDF — malware analysis report

Static analysis result for SHA-256 344b092a3c4c0440…

MALICIOUS

PDF

86.9 KB Created: 2021-03-26 16:47:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8e5b4c61f2f3162f7419fa6bfeca739e SHA-1: 8e8377530bd0ea8817994deb5b32b0073e9ec5f8 SHA-256: 344b092a3c4c044003528d941083f2b2eccd20092dc67b0c27e5b9409ae0c5fa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable hosting, and the document body, though garbled, suggests a lure related to 'brush pen alphabet practice sheets'. The presence of embedded URLs indicates an attempt to redirect the user to potentially malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/123?utm_term=brush+pen+alphabet+practice+sheets PDF link annotation
    • https://cdn.sqhk.co/salozudat/c0eii4H/99607962311.pdfIn PDF document text
    • https://cdn.sqhk.co/xinovupu/9gjcgd6/lojilof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448731/normal_602ea47f50e46.pdfIn PDF document text
    • http://podarokinsta24.online/no_mirrors_in_my_nana_s_houseuto5w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_603380f3e84c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405437/normal_5fe5972f20fe3.pdfIn PDF document text
    • https://cdn.sqhk.co/temegolu/wE3ggcT/34939040145.pdfIn PDF document text
    • http://segway-wheelchair.ru/bleach_vs_naruto_1._1._0_apkjo4n0.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/fannie_mae_guidelines_alimony_incomek8i8x.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/i56hhii/star_wars_the_old_republic_mod_vendor_locations.pdfIn PDF document text
    • https://cdn.sqhk.co/mekibekowufe/icjfLZq/mozuj.pdfIn PDF document text
    • http://islta.fun/k_masal_okeywfs82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450734/normal_603db813d3b8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425504/normal_5feeaac919bd8.pdfIn PDF document text
    • http://creditscoretracking.info/97194073863f5kw8.pdfIn PDF document text
    • https://cdn.sqhk.co/kozuvurop/FhiihbA/91261166378.pdfIn PDF document text
    • http://submonster.xyz/80183392667anetc.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/zedudo/nintendo_ds_lite_coral_pink_new.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/siwutewoveniruvojake.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/84635673937.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/the_boy_in_the_striped_pajamas_netflix_philippines.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 5212 bytes
SHA-256: 49457b27053becdace6560d554c0fa3c7ee65f38864d111634fdfff410952488
font_01_sfnt_off00011179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 11988 bytes
SHA-256: 59c68d0d7286fbe9eac5d967a65b188ce4e8fd203a44340463cd556731c383bc
font_02_sfnt_off000138de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DE 16192 bytes
SHA-256: 0c9d97902ffb76c2bb90ec10612787d93fde30e1015eb44c1a98e69c0dcea6df

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