Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8f511b5cedd7d8…

MALICIOUS

PDF

77.9 KB Created: 2021-04-30 04:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fda0b066628dddcd600a1f51bd264b3e SHA-1: dbe4faa9b303e6e451dd23181a91ac8d107a50d8 SHA-256: 7d8f511b5cedd7d86df5b1d3ef91dba7cc238aadd3f2d3a8e19f016f22e7d614
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely intended to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a review.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://xezojetit.ru/strik?utm_term=attached+amir+levine+review
    • https://cdn-cms.f-static.net/uploads/4489042/normal_6013ca47ab664.pdf
    • http://lozotago.iblogger.org/zarepokujefife.pdf
    • https://cdn-cms.f-static.net/uploads/4386593/normal_60586bb5b18bc.pdf
    • http://kabomodom.iblogger.org/benuxajapirabeku.pdf
    • https://cdn-cms.f-static.net/uploads/4366008/normal_605abb5d75caa.pdf
    • https://static.s123-cdn-static.com/uploads/4446260/normal_5fdf6a5f8d482.pdf
    • http://lavisil.22web.org/58080801969.pdf
    • http://tufusojakigun.iblogger.org/jurnal_manfaat_cacing_tanah.pdf
    • https://static.s123-cdn-static.com/uploads/4418778/normal_5ff51a0bf144c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/poresi/fluval_206_filter.pdf
    • http://vofaxov.epizy.com/toyota_corolla_altis_2009_tyre_size.pdf
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_aef401a313f54699a154a0b0ea3dcf1a.pdf?index=true
    • https://aeedc83c-a41d-4179-9d48-e770e4c4cd47.filesusr.com/ugd/e010a7_14e111d8904d4431bf1024d665ee4378.pdf?index=true
    • http://tufeloxe.rf.gd/arithmetic_sequence_worksheet_algebra_1.pdf
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_98f133d8fc594051b9a016e9f367d58b.pdf?index=true
    • https://s3.amazonaws.com/bisegilupuf/wakigoniro.pdf
    • http://xatosizukav.epizy.com/pdf_split_and_merge_freeware.pdf
    • http://lawupoxag.epizy.com/wenivironirupoxob.pdf
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_76f5deb3f93d4dbba42c0a3c2ebe0ac0.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f265.bin
87374b4e88506f45bea978cb6bf000f49eab5c63550cf0a0c62f638f50736fd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 5140 bytes
font_01_sfnt_off000103c5.bin
c137fac54f6b38155880fd86df270ced36bdd6f937f21b6b21bf57093c51f0e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 10928 bytes