Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b622bed5cdac86…

MALICIOUS

PDF

72.9 KB Created: 2021-02-10 19:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9992313cde8e56df9f624e12fc937886 SHA-1: 9b14d3026bfa85157ff08ade9f9589b975fde266 SHA-256: 97b622bed5cdac8667880ba6b2285588bae0817ef5bd9c7729ae4f55207c99d3
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text that appears to be a lure related to online content, further supporting a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/123?utm_term=domestic+na+kanojo+episode+12+reddit In PDF document text
    • https://cdn.sqhk.co/kesusevuzep/jegeMij/t-_mobile_familymode_home_base_review.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/jbxwK66/repulizafabuto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458122/normal_5fe0c7c1864cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453909/normal_601ee2f33b2f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_6014e936124aa.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/hfjbrL3/bigasikugolikuk.pdfIn PDF document text
    • https://cdn.sqhk.co/vitikitema/789Yxib/21866371013.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481422/normal_5fcf2aa9135dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447263/normal_6007c8add8e48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457847/normal_5fce34c4c877b.pdfIn PDF document text
    • http://menedowu.iblogger.org/mopemaxav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sojisij.epizy.com/cedar_point_map_2017.pdfIn PDF document text
    • http://wozaxanakix.epizy.com/waltz_no_2_violin_sheet_music.pdfIn PDF document text
    • http://limulusukad.rf.gd/54521493184.pdfIn PDF document text
    • http://jigiwema.epizy.com/punjabi_bhajan_dj_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/mommy_to_be_corsage_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/lpbwa_disclosure_guidelines.pdfIn PDF document text
    • http://fokezazonof.epizy.com/yii2_gridview_column_template.pdfIn PDF document text
    • http://sejabozewilobog.epizy.com/really_difficult_riddles_with_answers.pdfIn PDF document text
    • http://gebozobab.epizy.com/vubafitusa.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/60889134986.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD196 5508 bytes
SHA-256: a9331f86878cade1b9da2a5e299126af0761c71a00e4c4325616b7a81e220cd0
font_01_sfnt_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 10840 bytes
SHA-256: 160e873787904dda7d9f40153ef1b997b394212d103a7a92cbe86a0fbc381108