Malicious PDF — malware analysis report

Static analysis result for SHA-256 abeef298d9b6d383…

MALICIOUS

PDF

80.5 KB Created: 2021-04-02 18:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23a463e3ab86289f5674969626f17b80 SHA-1: 65f9662c370d599dbe77d6ebe8bc5cbf1e595d07 SHA-256: abeef298d9b6d383cf00c0c75bb7d74aa895522f9c03111ac4570f8fb7bdc9a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, indicating a link farm or phishing attempt. The PDF document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest the intent is to redirect users to malicious websites. The primary IOCs are the external URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=flysky+fs-ia6b+sbus
    • http://jirafka.space/90769666183p7wfm.pdf
    • https://cdn.sqhk.co/nujidegowupi/iejijeY/crushed_drop_method.pdf
    • https://cdn.sqhk.co/fewisezux/jfqnJqJ/save_earth_2020.pdf
    • https://cdn.sqhk.co/vozevadijut/WXvhial/might_and_glory_kingdom_war_mod_apk.pdf
    • https://tuwakunasuj.weebly.com/uploads/1/3/0/8/130874309/vitixa_wuwulobixaz_zuzazevaxuta_toleselilegik.pdf
    • http://bet-info.ru/61810725734xc595.pdf
    • http://healthyforczechrepublic.site/solving_linear_equations_for_y_worksheetccz5p.pdf
    • https://lolijejolo.weebly.com/uploads/1/3/4/4/134442146/a7241130ffdf.pdf
    • http://bandalet.club/how_to_use_bitmap_in_android_studioueze8.pdf
    • https://cdn.sqhk.co/poronujefino/bQekfjh/thai_alphabet_song_english_lyrics.pdf
    • http://tb-films.ru/671865538845nq0s.pdf
    • http://telovajov.medianewsonline.com/bazinozo.pdf
    • https://togajakuro.weebly.com/uploads/1/3/1/4/131409127/1432858.pdf
    • https://wilukogata.weebly.com/uploads/1/3/5/3/135388132/dusus.pdf
    • http://rixadixiji.scienceontheweb.net/fire_magazine_file_download.pdf
    • http://vvd.bar/824211030197nz8o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://zaruxokogidut.epizy.com/tixix.pdf
    • http://papewemejivore.rf.gd/witobokofikebag.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca8.bin
f4c73d0078e6484b001bd591845a2aba3ef6d8f385c938e7c3a34f6659f6cc20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA8 5112 bytes
font_01_sfnt_off0000ee32.bin
a67227def2ca524f2f18aedf7a66be09552bc920deeb479a0b03b047751292b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 10312 bytes
font_02_sfnt_off00010b72.bin
0053400bbde47d6c395c13f1c26ba041fda6f6e63bb17312c392bdc19a4a624a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 11580 bytes

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