Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7e1c56bdef9454…

MALICIOUS

PDF

84.8 KB Created: 2021-04-02 05:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51069b4962f3bf2b533556c82873a202 SHA-1: d14f9b7dc4ed87df92ca1612fb91ede0685cba26 SHA-256: 4c7e1c56bdef9454372851eb6fd74a635f7a1edbb4857896c53d230a5c274426
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 potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous external links points towards a tactic of directing users to external resources, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://golowaki.ru/award?keyword=audiology+science+to+practice+third+edition+pdf
    • http://kegetisa.mygamesonline.org/19527165970.pdf
    • https://zolotamazuragif.weebly.com/uploads/1/3/2/7/132712333/1567869.pdf
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/jojifuzunotod-jovesoxefo-betogumi.pdf
    • http://tadosuzewamu.medianewsonline.com/bhaktamar_yantra.pdf
    • http://nadipewin.mywebcommunity.org/35496205194.pdf
    • http://inmyshtangen.xyz/bowflex_power_pro_xtl_home_gym_manualju0ne.pdf
    • https://ruzovaberup.weebly.com/uploads/1/3/4/6/134651658/fitopijopusuwuj-kesotegimu.pdf
    • http://tixshopclub.space/xulexapotaa1zo9.pdf
    • https://guvoxokogavi.weebly.com/uploads/1/3/4/3/134374443/tinawo-lejupinoniwalo.pdf
    • https://sinukofulav.weebly.com/uploads/1/3/4/6/134634738/4ec3e4b8.pdf
    • http://fafikup.scienceontheweb.net/anthropology_for_upsc.pdf
    • https://mebavobof.weebly.com/uploads/1/3/4/5/134592521/bujufiredopog.pdf
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/8246858.pdf
    • https://rofowijajexer.weebly.com/uploads/1/3/4/4/134476616/7005418.pdf
    • http://doucheapp.xyz/change_battery_timex_watch_wr30m7sh7z.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://www.daltonmaag.com/
    • http://polilofu.onlinewebshop.net/11_22_63_audiobook_length.pdf
    • http://vurofanosikuga.atwebpages.com/mezelasadisuren.pdf
    • http://zalatikewal.atwebpages.com/history_of_english_literature_age_wise.pdf
    • http://lopakesuzuw.atwebpages.com/32410060457.pdf
    • http://mikijanux.atwebpages.com/clinical_research_associate_job_description.pdf
    • http://fowakoleviwamop.onlinewebshop.net/luvakonud.pdf
    • http://nakixaxev.myartsonline.com/coronary_artery_disease.pdf
    • http://biwosagamivi.myartsonline.com/aspekto_ng_pandiwa_grade_3_worksheet.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ee.bin
440117703f6810bfb0e27ac877d74ab1c2d453698abaaca33fc33cefc08fe952		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 5392 bytes
font_01_sfnt_off00010334.bin
d8e4b7f44dfb66ea49c7f1cefd345a391fade3fb548cc17de4cdbf151663dabd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 6068 bytes
font_02_sfnt_off000112e5.bin
1d0c813fdd9865d685b953c1d29fc474985942da370804a70193ba5a81ebaf5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112E5 10000 bytes
font_03_sfnt_off00013529.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13529 4324 bytes

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