Malicious PDF — malware analysis report

Static analysis result for SHA-256 81858bcc8e1719dc…

MALICIOUS

PDF

77.2 KB Created: 2021-03-23 14:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c563f758d6e77688cc7c9f58a1361464 SHA-1: d5fbedd6e8e0b690073ba5e310c0a4b0e251dafd SHA-256: 81858bcc8e1719dc7930c8a0009a4f9db2b7a38f587174bed5f43937bd733ba1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=ricks+sports+bar+sneads+ferry
    • http://everydayy.fun/27646845481htoe4.pdf
    • http://foxinawolukomat.iblogger.org/how_much_does_an_airstream_rv_cost.pdf
    • https://jobekivisa.weebly.com/uploads/1/3/4/5/134584889/7359302.pdf
    • http://rent-nout.site/90576201246t10ld.pdf
    • https://maladekokox.weebly.com/uploads/1/3/4/7/134745457/2281223.pdf
    • http://rocketdocs.us/981584174908rq4n.pdf
    • http://vsspb.ru/lg_home_theater_500w_blu-ray_bh5140se4ssq.pdf
    • https://jevijoju.weebly.com/uploads/1/3/5/9/135978445/tusudavokid.pdf
    • http://1xbets-regs.site/woodrow_wilson_public_administration_pptjstlo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_3ae7eac3200b407f925e9b194053d323.pdf?index=true
    • http://zelimasiropaf.epizy.com/nonidikisutoxifi.pdf
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_b3a15d5843414eb58d8efe8bd2b65d3b.pdf?index=true
    • https://2aa0b900-127f-4603-a19a-6a731d3c9eb1.filesusr.com/ugd/5eaffa_36e868b2d98a44949e3379757fc78f62.pdf?index=true
    • http://safodur.epizy.com/troy_bilt_tb35ec_weed_eater_line_replacement.pdf
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_5a5579bf65b6453aa1672f584b7ab6fb.pdf?index=true
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_31881c8cb51c4004a3b6007a457e6a86.pdf?index=true
    • http://wiwifiladovov.epizy.com/nail_salon_near_me_open_on_christmas.pdf
    • https://fff5164c-1337-4dca-a870-9ee8129e9d1f.filesusr.com/ugd/11cbe4_34b2d33ccd5040259bae2e7fb468bb4c.pdf?index=true
    • https://ddd90330-5837-4e0c-b2f6-9383941cd2db.filesusr.com/ugd/568e2c_18c900e6eb9a49419339ded66ff73b5a.pdf?index=true
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_5111d4f13383458c8c7801a9c8754f26.pdf?index=true
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_cc695fe6aaae418baa2c3d8669a2ea49.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e122.bin
cd83174633ca23a864b178b343d00168dec4596f75d5e2859b9a9e11e7a14c5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 5220 bytes
font_01_sfnt_off0000f2ef.bin
f9ee2581caf5df8e96b785e4d7eb2940dea1cb1227f258698b0e78be15067160		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 11424 bytes
font_02_sfnt_off0001196e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.