Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7437c6ed889d2cf…

MALICIOUS

PDF

75.6 KB Created: 2021-03-23 21:13:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 47ad3c9608e863e2247a8f9c3cdcd833 SHA-1: 7d816183e920e3ee28a78342dccf647fa10d0cfc SHA-256: d7437c6ed889d2cfb52d2c5bf713f833714841f51dd979d70fbd5db57ff22a50
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and redirector infrastructure, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to 'nursing care plan for depression patient pdf', likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=nursing+care+plan+for+depression+patient+pdf In PDF document text
    • http://bewudewumit.sportsontheweb.net/11th_bio_zoology_practical.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/3SjedEN/32382368403.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/assessment_procedures_for_counselors_and_helping_professionals.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/hiQidFp/zombie_age_3_premium_apk_free.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/6hdigjb/calligraphy_fonts_free_marathi.pdfIn PDF document text
    • https://lejigatoni.weebly.com/uploads/1/3/1/8/131871980/a1bbbdc56047b1d.pdfIn PDF document text
    • http://idealica-official.website/90006891978aa7lo.pdfIn PDF document text
    • http://mscredit.info/76231855968jip8m.pdfIn PDF document text
    • https://daguvosiliwu.weebly.com/uploads/1/3/1/4/131406153/97a5bec8b6e3.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/9hfiguR/block_craft_3d_hack_file_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zanudiwageg/ghihjHP/dugev.pdfIn PDF document text
    • http://zovitidagawas.sportsontheweb.net/80679894151.pdfIn PDF document text
    • http://lightstart.xyz/tractor_supply_winchester_24_gun_safe_reviewqcimj.pdfIn PDF document text
    • http://tefozunamosolo.iblogger.org/facebook_lite_for_nokia_e63_java.pdfIn PDF document text
    • https://bufudelazevel.weebly.com/uploads/1/3/4/7/134734798/9075382.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mosasawimip.epizy.com/fokokefefodoladivis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceb14496-3d3a-47d8-99b0-dd1da023185e/14395495965.pdfIn PDF document text
    • http://jomilibilafij.epizy.com/what_caused_the_constitution_of_1791.pdfIn PDF document text
    • http://gematufevisuw.rf.gd/13067920575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97f63b7a-ccb5-4248-8433-5951a1c9f208/vavuzodimuposuvuvaxuwed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9302c4ff-c7de-4083-a03e-151f9ad569fc/what_does_tantric_mean_in_india.pdfIn PDF document text
    • http://savapiwanew.epizy.com/zinerasegadoluxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd9199e4-9a62-4e4d-a2d7-1465e6980d98/rt-ac68u_merlin_firmware_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 5292 bytes
SHA-256: 94f0f8630c63f3e972dae97d3111abf566d65f362357facec280e85660d46792
font_01_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 10624 bytes
SHA-256: 5f15a44d216740865d2abaf2a4c142450a8eddac1abd0bb92d2b7ae4ff05f43f