Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d721b768b1b025…

MALICIOUS

PDF

79.3 KB Created: 2021-03-24 11:17:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3c581443b063504c38209861daf8368 SHA-1: d9014a6daefe6ced0cc3d277941c848c4e73fc19 SHA-256: 21d721b768b1b025f995039649182266e17d5afa76c55030aa97f0ea7ecce6e4
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is used to host numerous external URIs.

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://midufefew.ru/wix?keyword=ruixin+pro+angle+knife+sharpener+manual
    • http://fakts.design/95318818709ps5ng.pdf
    • https://wuxelulomevadi.weebly.com/uploads/1/3/4/9/134904547/fusesejikebofideseg.pdf
    • https://kiwepuzimogavuf.weebly.com/uploads/1/3/0/7/130776877/tedoxera.pdf
    • http://50offstore.info/stihl_ms_180_chainsaw_parts_diagramk8yqu.pdf
    • https://kamowomol.weebly.com/uploads/1/3/4/3/134371521/3264198.pdf
    • https://ximinelinax.weebly.com/uploads/1/3/4/3/134313791/dabewofamu_luveke_reboxuwabo.pdf
    • http://kukushpa.fun/fugogosudesosavutalepygz3v.pdf
    • https://bategasef.weebly.com/uploads/1/3/2/7/132712490/2d5dbd70deaca3.pdf
    • https://dejoputaxili.weebly.com/uploads/1/3/4/7/134763817/loxuwuposujezus.pdf
    • http://dontbeshy.xyz/sazivoj4szwp.pdf
    • http://idealicaitalia.website/zekibawezavuwiwi5a0q8.pdf
    • http://idealica-co.site/192687993vv7ac.pdf
    • http://disclosures.space/35674359250uxbpx.pdf
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/51e552608.pdf
    • https://xodetawutal.weebly.com/uploads/1/3/0/7/130774968/katividupo_zozaxifi_tigamegegotose_tikolefivedax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_5ac3a6e65c244c61b8bd72e1566fa344.pdf?index=true
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_d9a41c3c38c74dfdba41c5ddffb5af1e.pdf?index=true
    • https://s3.amazonaws.com/kovozenamofox/multiplying_decimals_worksheets.pdf
    • https://cd65756b-a9c7-4cca-9498-1747a6459195.filesusr.com/ugd/05eb20_2ea9c04ce02f4e68937b214a88b22d84.pdf?index=true
    • https://s3.amazonaws.com/vavabi/17215270556.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed81.bin
b637f0a056f10340f7a119cbe41f404d7f5c9dd840f90c306cd7ffcc80785337		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 5452 bytes
font_01_sfnt_off0000fff1.bin
ce1b4335213c73d586cb773df8890b2b0ec55f4031acb1e72322e25aebd4b271		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 1872 bytes
font_02_sfnt_off000108fc.bin
f6df49193de46458649380f8708d2a47b3e3b08f27f2bbd760fe35b8d1d7c0e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 11212 bytes

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