Malicious PDF — malware analysis report

Static analysis result for SHA-256 46194b2bd591329a…

MALICIOUS

PDF

73.4 KB Created: 2021-02-10 02:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2bfb0d436b923cb0cc7b997c97a6c76c SHA-1: 0373cbe3377f17d93cf66350b565e3a778a93922 SHA-256: 46194b2bd591329af08a0b42649e08cd1677f4adc3b716506c2a55a53654acea
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to photo editing apps, which is often used in phishing campaigns. The presence of multiple links to disposable hosting further supports a phishing or malware distribution scheme.

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
  • 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/aws?utm_term=fabby+photo+editor+camera+app In PDF document text
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5fdf7e61cb78a.pdfIn PDF document text
    • https://nunatazireru.weebly.com/uploads/1/3/4/6/134698050/doguzomorek-devurilotatene-denadi.pdfIn PDF document text
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/dusub-kovadokosu-jomosod.pdfIn PDF document text
    • https://vesevowix.weebly.com/uploads/1/3/3/9/133987154/muwunifesazogedob.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/feqN7jc/new_zombie_movies_2020_korean.pdfIn PDF document text
    • https://cdn.sqhk.co/belerudoxej/jifPgcp/xusovenagep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469630/normal_5ff391fe8417d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450883/normal_601166029fa73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460066/normal_5ffb565190903.pdfIn PDF document text
    • http://aycotoro7.xyz/ludixufuraguwerilebgesbm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xewabilema.epizy.com/kadofus.pdfIn PDF document text
    • http://lawazujazigefon.epizy.com/85214307371.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/hydrolysis_of_ester_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/31240113693.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4E 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off0000cd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD43 5300 bytes
SHA-256: fc1293334950431194780d467c21f9daed63e768d453e36c9d777756224be079
font_02_sfnt_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 10152 bytes
SHA-256: cf3d18aff3a40b565840ffe0aa8e913203de51574b6254ab40e44dbc6ff836fb
font_03_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 16396 bytes
SHA-256: 106c7962cb462b320f4e5399b8d150580cf0b6da63f356e2ad36fc4c1ec7d35e

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